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;
char str[100];

int main(void)
{
	scanf("%d %d%*c", &n, &k);
	int i;
	for(i=0;i<n;i++)
		scanf("%c", &str[i]);
	str[n] = '¥0';

	str[k-1] += 32;
	
	
	printf("%s", str);
	return 0;
}