#include <iostream>
#include <string>
#include <cctype>
using namespace std;

string lowerCase(string str) {
for (int i = 0; i < str.length(); i++) {
str[i] = tolower(str[i]);
}
return str;
}

int main() {
string str;
cin >> str;

while (str != "STOP") {
    cout << lowerCase(str) << '\n';
    cin >> str;
}

return 0;

}