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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <iostream>
using namespace std;

int main() {
    int n,k;
    string s;
    //s = "ABCACCCA";
    //n = 8;
    //k = 5;
    cin >> n >> k >> s;

    if(s[k] == 'A'){
        s[k] = 'a';
        std::cout << s << std::endl;
    }else if(s[k] == 'B'){
        s[k] = 'b';
        std::cout << s << std::endl;
    }else{
        s[k] = 'c';
        std::cout << s << std::endl;
    }

}