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 i,j,k,n;
	char A[10000];
	scanf("%d",&n);
	scanf("%d",&j);
	for(i=1;i<=n+1;i++)
	{
		scanf("%c",&A[i]);
	}
	A[j+1]=A[j+1]+32;
	for(i=1;i<=n+1;i++)
	{
		printf("%c",A[i]);
	}
}