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;

namespace AtCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            // a-z(97-122), A-Z(65-90)
            var c = ReadLineStr();
            if(97 <= c[0] && c[0] <= 122)
            {
                Console.WriteLine("a");
            }
            else
            {
                Console.WriteLine("A");
            }
        }

        #region 使いまわし
        static string ReadLineStr() { return Console.ReadLine(); }
        static int ReadLineInt() { return Convert.ToInt32(Console.ReadLine()); }
        static (int, int) ReadLineInt2()
        {
            var temp = Console.ReadLine().Split(' ');
            return (Convert.ToInt32(temp[0]), Convert.ToInt32(temp[1]));
        }
        #endregion
    }
}