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)

// BEGINNING WITH THE NAME OF ALMIGHTY GOD ALLAH
// AUTHOR:: MOHAMMAD FAISAL
#include<bits/stdc++.h>
using namespace std;
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.flush();
	int n,k;
   	cin >> n >> k;
  string s;
    cin >> s;
  	for(int i=0;i<n;i++)
    {
      if(s[i+1]==k)
        cout<<s[i]-32;
      else
        cout<<s[i];
    }
	return 0;
	// BYE BYE
}