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.*;
import java.lang.Character;

class Main {
  public static void main(String[] args) {
    Map<Integer, String> map = new HashMap<Integer, String>();
    Scanner scanner = new Scanner(System.in);
    int length = scanner.nextInt();
    int target = scanner.nextInt();
    String line = scanner.next();
    for (int i = 0; i < length; i++) {
      if (i == target - 1) {
        System.out.print(Character.toLowerCase(line.charAt(i)));
      }
      else {
        System.out.print(line.charAt(i));
      }
    }
  }
}