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() {
	int n, k, i;
	char s[50];

	scanf("%d %d", &n, &k);
	scanf("%s", s);

	k -= 1;

	if (s[k] == 'A')
		s[k] = 'a';
	if (s[k] == 'B')
		s[k] = 'b';
	if (s[k] == 'C')
		s[k] = 'c';

	i = 0;
	while (s[i] != '\0') {
		printf("%c", s[i]);
		i++;
	}

	printf("\n");
}