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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
class Program
{
	static void Main(string[] args)
	{
		// 入力
		string s = Console.ReadLine();

    if (Char.IsUpper(Convert.ToChar(s)))
    {
      Console.WriteLine("A");  
    }
    else
    {
      Console.WriteLine("a");  
    }
  }
}