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//time 
 
int main() {
		freopen("acronym.in", "r", stdin);
	Keyboard_Crackers();
	string s;
	cin >> s;
	int a; cin >> a;
	vector<string>v;
	map<char, priority_queue<string, vector<string>, greater<string> > >mp;
	map<char, priority_queue<string, vector<string>, greater<string> > >::iterator it;
	while (a--)
	{
		string t;
		cin >> t;
	mp[t[0]].push(t);
  }
 
	bool flag = 0;
	for (int i = 0; i < s.size(); i++) {
		if (mp.find(s[i]) != mp.end()) {
			it = mp.find(s[i]);
			//cout << it->first<< endl;
			priority_queue<string, vector<string>, greater<string> > temp;
			//multiset<string>::iterator z;
		temp = it->second;
			mp[s[i]].pop();
 
	   /* if (s[i]=='C'){
			  for (auto z : temp) {
				cout << z << endl;
			}	cout << temp.size()<<endl;
			}*/
			if (temp.empty()) {
				//cout << "wrong "<<endl;
				flag = 1;
				break;
			}
			else {
				string x = temp.top();
				v.push_back(x);
				temp.pop();
				it->second = temp;
			}
		}
		else {
			flag = 1;
		break;
		}
	}
	if (flag) {
		cout << "Impossible" << endl;
	}
	else {
		for (int i = 0; i < v.size(); i++) {
	cout << v[i] << " ";
		}
		cout << endl;
	}
 
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:4:30: error: ‘stdin’ was not declared in this scope
   freopen("acronym.in", "r", stdin);
                              ^~~~~
prog.cpp:4:30: note: ‘stdin’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
prog.cpp:1:1:
+#include <cstdio>
 //time
prog.cpp:4:30:
   freopen("acronym.in", "r", stdin);
                              ^~~~~
prog.cpp:4:3: error: ‘freopen’ was not declared in this scope
   freopen("acronym.in", "r", stdin);
   ^~~~~~~
prog.cpp:5:2: error: ‘Keyboard_Crackers’ was not declared in this scope
  Keyboard_Crackers();
  ^~~~~~~~~~~~~~~~~
prog.cpp:6:2: error: ‘string’ was not declared in this scope
  string s;
  ^~~~~~
prog.cpp:6:2: note: suggested alternative: ‘struct’
  string s;
  ^~~~~~
  struct
prog.cpp:7:2: error: ‘cin’ was not declared in this scope
  cin >> s;
  ^~~
prog.cpp:7:2: note: suggested alternative: ‘main’
  cin >> s;
  ^~~
  main
prog.cpp:7:9: error: ‘s’ was not declared in this scope
  cin >> s;
         ^
prog.cpp:9:2: error: ‘vector’ was not declared in this scope
  vector<string>v;
  ^~~~~~
prog.cpp:9:16: error: ‘v’ was not declared in this scope
  vector<string>v;
                ^
prog.cpp:10:2: error: ‘map’ was not declared in this scope
  map<char, priority_queue<string, vector<string>, greater<string> > >mp;
  ^~~
prog.cpp:10:2: note: suggested alternative: ‘main’
  map<char, priority_queue<string, vector<string>, greater<string> > >mp;
  ^~~
  main
prog.cpp:10:6: error: expected primary-expression before ‘char’
  map<char, priority_queue<string, vector<string>, greater<string> > >mp;
      ^~~~
prog.cpp:11:6: error: expected primary-expression before ‘char’
  map<char, priority_queue<string, vector<string>, greater<string> > >::iterator it;
      ^~~~
prog.cpp:14:9: error: expected ‘;’ before ‘t’
   string t;
         ^~
         ;
prog.cpp:15:10: error: ‘t’ was not declared in this scope
   cin >> t;
          ^
prog.cpp:16:2: error: ‘mp’ was not declared in this scope
  mp[t[0]].push(t);
  ^~
prog.cpp:21:7: error: ‘mp’ was not declared in this scope
   if (mp.find(s[i]) != mp.end()) {
       ^~
prog.cpp:22:4: error: ‘it’ was not declared in this scope
    it = mp.find(s[i]);
    ^~
prog.cpp:22:4: note: suggested alternative: ‘i’
    it = mp.find(s[i]);
    ^~
    i
prog.cpp:24:4: error: ‘priority_queue’ was not declared in this scope
    priority_queue<string, vector<string>, greater<string> > temp;
    ^~~~~~~~~~~~~~
prog.cpp:24:41: error: expected primary-expression before ‘,’ token
    priority_queue<string, vector<string>, greater<string> > temp;
                                         ^
prog.cpp:24:43: error: ‘greater’ was not declared in this scope
    priority_queue<string, vector<string>, greater<string> > temp;
                                           ^~~~~~~
prog.cpp:24:59: error: expected primary-expression before ‘>’ token
    priority_queue<string, vector<string>, greater<string> > temp;
                                                           ^
prog.cpp:24:61: error: ‘temp’ was not declared in this scope
    priority_queue<string, vector<string>, greater<string> > temp;
                                                             ^~~~
prog.cpp:40:11: error: expected ‘;’ before ‘x’
     string x = temp.top();
           ^~
           ;
prog.cpp:41:17: error: ‘x’ was not declared in this scope
     v.push_back(x);
                 ^
prog.cpp:52:3: error: ‘cout’ was not declared in this scope
   cout << "Impossible" << endl;
   ^~~~
prog.cpp:52:27: error: ‘endl’ was not declared in this scope
   cout << "Impossible" << endl;
                           ^~~~
prog.cpp:52:27: note: suggested alternative: ‘enum’
   cout << "Impossible" << endl;
                           ^~~~
                           enum
prog.cpp:56:2: error: ‘cout’ was not declared in this scope
  cout << v[i] << " ";
  ^~~~
prog.cpp:58:3: error: ‘cout’ was not declared in this scope
   cout << endl;
   ^~~~
prog.cpp:58:11: error: ‘endl’ was not declared in this scope
   cout << endl;
           ^~~~
prog.cpp:58:11: note: suggested alternative: ‘enum’
   cout << endl;
           ^~~~
           enum

Standard output is empty