#include <iostream>
#include <cmath>
#include <iomanip>
#include <string>
using namespace std;

int main() {
    string s;
    char c;
    cin >> s;
    c = s[0];
    if  (c >= 'A' && c <= 'Z')  {
        cout << c;
    }else{
        int temp;
        temp = c - 'A';
        c = 'a' + temp;
        cout <<c;
    }
    return 0;
}