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#include <iostream>
#include <stack>
#include <string>
using namespace std;
 
int main() {
	stack <char> st;
	char c;
	int ch=0;
	while( cin>>c ){
		if(st.emoty())st.push(c);
		else if (c==st.top()){
			st.pop();
			ch++;
		}
			else st.push(c);
	}
	if (ch=2) cout << ("Yes")
	else cout << ("No")
	return 0>
 
		}
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:11:9: error: ‘class std::stack<char>’ has no member named ‘emoty’; did you mean ‘empty’?
   if(st.emoty())st.push(c);
         ^~~~~
prog.cpp:19:2: error: expected ‘;’ before ‘else’
  else cout << ("No")
  ^~~~
prog.cpp: At global scope:
prog.cpp:24:2: error: expected unqualified-id before ‘return’
  return 0;
  ^~~~~~
prog.cpp:25:1: error: expected declaration before ‘}’ token
 }
 ^

Standard output is empty