https://www.acmicpc.net/problem/1159 #include #include #include using namespace std; int main() { ios_base::sync_with_stdio(false), cin.tie(0); string s; string name[151]; int n, al[26] = { 0, }, cnt = 0; cin >> n; for (int i = 0; i > name[i]; al[name[i][0] - 'a']++; } for (int i = 0; i = 5) { s += (i + 'a'); cnt++; } if (cnt == 0) { cout