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 ConsoleApp1
{
    class Program2
    {
        static void Main(string[] args)
        {
            //long n = long.Parse(Console.ReadLine());
            char[] inputLongArray1 = Console.ReadLine().Split(' ').Select(i => char.Parse(i)).ToArray();
            //long[] inputLongArray2 = Console.ReadLine().Split(' ').Select(i => long.Parse(i)).ToArray();

            string result = "a";


            if(Char.IsUpper(inputLongArray1[0]))
            {
                result = "A";
            }

            var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
            sw.Write(result);
            Console.SetOut(sw);
            Console.Out.Flush();
        }
    }
}