Problem:
Score : 100 points

Problem Statement

An uppercase or lowercase English letter \alpha will be given as input.
If \alpha is uppercase, print A; if it is lowercase, print a.

Constraints

\alpha is an uppercase (A - Z) or lowercase (a - z) English letter.

Input

Input is given from Standard Input in the following format:

α

Output

If \alpha is uppercase, print A; if it is lowercase, print a.

Sample Input 1

B

Sample Output 1

A

B is uppercase, so we should print A.

Sample Input 2

a

Sample Output 2

a

a is lowercase, so we should print a.

Solution in Java (OpenJDK 11.0.6) (judge verdict: Accepted)

import java.util.*;
public class Main {
	public static void main(String[] args){
	   Scanner sc = new Scanner(System.in);
	   String str = sc.next();
      
      if(str.length()==1 && !str.equals("@")){
 
      if(Character.isUpperCase(str.charAt(0))){
      	str = "A";
      }else{
        str = "a";
      }
		// 出力
		System.out.println(str);     
	}
        
      }
}