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>

int n, k;

int main(void){
    char s[1000];
    scanf("%d%d", &n, &k);
    for(int i = 0; i < n; i++) scanf("%d", &s[i]);
    k++;
    if(s[k] == 'A') s[k] = 'a';
    else if(s[k] == 'B') s[k] = 'b';
    else s[k] = 'c';

    for(int i = 0; i < n; i++) printf("%d\n", s[i]);
    return 0;
}