text: #include <iostream>
  #include <string>
  using namespace std;
  int main() {
  	string s;
  	cin >> s;
  	for (int i = 0; i < s.size(); i++) {
  		if ('A' <= s[i] && s[i] <= 'Z') {
  			cout << s[i];
  		}
  	}
  	return 0;
  }