Problem:
Score : 100 points

Problem Statement

You are given a string S of length N consisting of A, B and C, and an integer K which is between 1 and N (inclusive).
Print the string S after lowercasing the K-th character in it.

Constraints

1 ≤ N ≤ 50

1 ≤ K ≤ N

S is a string of length N consisting of A, B and C.

Input

Input is given from Standard Input in the following format:

N K
S

Output

Print the string S after lowercasing the K-th character in it.

Sample Input 1

3 1
ABC

Sample Output 1

aBC

Sample Input 2

4 3
CABA

Sample Output 2

CAbA

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace ABC_126_A_Csharp_ver
{
    class Program
    {
        static void Main(string[] args)
        {
            var word = Console.ReadLine().Split(' ');
            string S = Console.ReadLine();
            int N = int.Parse(word[0]);
            int K = int.Parse(word[1]);
            char[] s = S.ToCharArray();
            s[K - 1] = Char.ToLower(s[K - 1]);
            Console.WriteLine(s);
            Console.ReadKey();
        }
    }
}