#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

const int N = 10010;

char a[N];
int n;

int main(){
    scanf("%d", &n);
    scanf("%s", a);
    for ( int i = 0; i < n; i ++  )
        if ( a[i] >= 'A' && a[i] <= 'Z' )
            a[i] = a[i] - 'A' + 'a';
    for ( int i = 0; i < n; i ++ )
        cout << a[i];
    return 0;
}