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: Wrong Answer)

#include <stdio.h>
#include<string.h>
int main(void){
    int N,K,i;
    scanf("%d",&N);
    scanf(" %d\n",&K);
    char array[50];
    for (i=0;i<N;i++){
        scanf("%s",&array[i]);
    }
    if(strncmp("A",&array[K-1],1)==0){
        array[K-1]="a";
    }else if(strncmp("B",&array[K-1],1)==0){
        array[K-1]="b";
    }else if(strncmp("C",&array[K-1],1)==0){
        array[K-1]="c";
    }
    printf("%s",array);
    return 0;
}