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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
int main(void){
    int N = 0; int K = 0;
    scanf("%d", &N);
    scanf("%d", &K);

    char line[N];

    for(int i = 0; i <= N; i++){
        scanf("%c", &line[i]);
    }

    line[K] = line[K] + 32;

    for(int i = 0; i <= N; i++){
        printf("%c", line[i]);
    }
    printf("\n");
    return 0;
}