Java :

import java.util.Scanner;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		String s = input.next();
		char c = s.charAt(0);
		if (c >= 'A' && c <= 'Z') {
			c = (char) (c - 'A' + 'a');
		} else if (c >= 'a' && c <= 'z') {
			System.out.print("小");
		}
		System.out.println(c);
	}

}