PrSet13

#include <iostream>
#include <fstream>
#include <set>
#include <string>
#include <algorithm>

using namespace std;

int main()
{
    ifstream in("/Users/masha/Documents/PrSet13/PrSet13/input");
    int n;
    in >> n;
    set<char>::iterator it;

    set<char> alphabet;

    for (char c ='a'; c <= 'z'; c++)
        alphabet.insert(c);

    string s;
    getline(in, s);
    for (int i = 0; i < n; i++)
    {
        set<char> result;
        getline(in,s);
        transform(s.begin(), s.end(), s.begin(), ::tolower);
        set <char> str(s.begin(),s.end());

        set_difference(alphabet.begin(), alphabet.end(), str.begin(), str.end(),
                      std::inserter(result, result.end()));

        for (it = result.begin(); it != result.end(); it++)
            cout << *it << " ";
        cout << endl;
    }

    return 0;
}