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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
public class Main{
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    int k = sc.nextInt();
    String s = sc.next();
    char[] c = new char[n];

    for(int i=0 ; i<n ; i++){
      c[i] = s.charAt(i);
    }
    if(c[k-1]=='A') c[k-1]='a';
    if(c[k-1]=='B') c[k-1]='b';
    if(c[k-1]=='C') c[k-1]='c';

    for(int i=0 ; i<n ; i++){
      System.out.print(c[i]);
    }
    System.out.println();
  }
}