#include <iostream>
#include <ctype.h>
using namespace std;

int main(void)
{
	char ch;
	cin >> ch;
	if (ch >= 'A' && ch <= 'Z')
	{
		ch = tolower(ch);
		cout << ch;
	}
	else
	{
		cout << ch;
	}

	system("pause");
	return 0;
}