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)
    {
        var c = Read();
        string alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        if (alphabets.Contains(c))
        {
            Console.WriteLine("A");
        }
        else
        {
            Console.WriteLine("a");
        }
    }

    private static string Read() => Console.ReadLine();
    private static char[] ReadChars() => Array.ConvertAll(Read().Split(), a => a[0]);
    private static int ReadInt() => int.Parse(Read());
    private static long ReadLong() => long.Parse(Read());
    private static double ReadDouble() => double.Parse(Read());
    private static int[] ReadInts() => Array.ConvertAll(Read().Split(), int.Parse);
    private static long[] ReadLongs() => Array.ConvertAll(Read().Split(), long.Parse);
    private static double[] ReadDoubles() => Array.ConvertAll(Read().Split(), double.Parse);
}