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: Runtime Error)

using System;
using System.Linq;
class program{
  static void Main(){
    int n = int.Parse(Console.ReadLine());
    int[] a = Array.ConvertAll(Console.ReadLine().Split(' '),int.Parse);
    int[] table = new int[100001];
    for(int i = 0;i<n;i++){
      table[a[i]]++;
    }
    n = int.Parse(Console.ReadLine());
    var ans = a.Sum();
    int[] bc = Array.ConvertAll(Console.ReadLine().Split(' '),int.Parse);
    for(int i = 0;i<n-1;i++){
      ans += (bc[1]-bc[0])*table[bc[0]];
      table[bc[1]] += table[bc[0]];
      table[bc[0]] = 0;
      Console.WriteLine(ans);
      bc = Array.ConvertAll(Console.ReadLine().Split(' '),int.Parse);
    }
    ans += (bc[1]-bc[0])*table[bc[0]];
    table[bc[1]] += table[bc[0]];
    table[bc[0]] = 0;
    Console.WriteLine(ans);
  }
}