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;
using System.Collections.Generic;
using System.Linq;

namespace AtCoder200531
{
    class Program
    {
        static void Main(string[] args)
        {
            //int n = int.Parse(Console.ReadLine());
            //List<int> inputs = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToList();
            char[] input = Console.ReadLine().ToCharArray();

            if (Char.IsUpper(input[0]))
            {
                Console.WriteLine("A");
            }
            else
            {
                Console.WriteLine("a");
            }
        }
    }
}