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#include <iostream>
#include <map>
#include <string>
#include <set>
#include <vector>
using namespace std;
 
int main() {
    int n;
    cin >> n;
    map <string, set <string>> engLat, latEng;
    while (n--) {
        string eng, lat, word;
        cin >> eng;
        getline(cin, lat);
        lat += ",";
        for (int i = 3; i < lat.length(); i++) {
            if (isalpha(lat[i])) word += lat[i];
            else {
                engLat[eng].insert(word);
                word.clear();
                i++;
            }
        }
    }
 
    for (auto x : engLat) {
        for (auto y : x.first) {
            latEng[y] = x.first;
        }
    }
 
    cout << latEng.size() << endl;
 
    for (auto x : latEng) {
        cout << x.first << " - ";
        int count = 1;
        for (auto y : x.first) {
        	if (count < x.second.size()) {
        		cout << ", ";
        		count++;
        	}
            cout << y;
        }
        cout << endl;
    }
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:29:19: error: no match for ‘operator[]’ (operand types are ‘std::map<std::__cxx11::basic_string<char>, std::set<std::__cxx11::basic_string<char> > >’ and ‘char’)
             latEng[y] = x.first;
                   ^
In file included from /usr/include/c++/8/map:61,
                 from prog.cpp:2:
/usr/include/c++/8/bits/stl_map.h:490:7: note: candidate: ‘std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = std::__cxx11::basic_string<char>; _Tp = std::set<std::__cxx11::basic_string<char> >; _Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::set<std::__cxx11::basic_string<char> > > >; std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type = std::set<std::__cxx11::basic_string<char> >; std::map<_Key, _Tp, _Compare, _Alloc>::key_type = std::__cxx11::basic_string<char>]’
       operator[](const key_type& __k)
       ^~~~~~~~
/usr/include/c++/8/bits/stl_map.h:490:7: note:   no known conversion for argument 1 from ‘char’ to ‘const key_type&’ {aka ‘const std::__cxx11::basic_string<char>&’}
/usr/include/c++/8/bits/stl_map.h:510:7: note: candidate: ‘std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](std::map<_Key, _Tp, _Compare, _Alloc>::key_type&&) [with _Key = std::__cxx11::basic_string<char>; _Tp = std::set<std::__cxx11::basic_string<char> >; _Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::set<std::__cxx11::basic_string<char> > > >; std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type = std::set<std::__cxx11::basic_string<char> >; std::map<_Key, _Tp, _Compare, _Alloc>::key_type = std::__cxx11::basic_string<char>]’
       operator[](key_type&& __k)
       ^~~~~~~~
/usr/include/c++/8/bits/stl_map.h:510:7: note:   no known conversion for argument 1 from ‘char’ to ‘std::map<std::__cxx11::basic_string<char>, std::set<std::__cxx11::basic_string<char> > >::key_type&&’ {aka ‘std::__cxx11::basic_string<char>&&’}

Standard output is empty