#include<iostream> #include<string> using namespace std; int main() { string str; int num[256] = { 0 }; getline(cin, str); for (int i = 0; i < str.size(); ++i) { num[str[i]]++; if (num[str[i]] == 3&&((str[i]<='z'&&str[i]>='a')||(str[i] <= 'Z'&&str[i] >= 'A'))) { cout << str[i]; break; } } system("pause"); return 0; }