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()
{
    #ifndef ONLINE_JUDGE
   freopen("input.txt" , "r" , stdin);
   freopen("output.txt" , "w" , stdout);
  #endif
    int c,n;
  cin >> n >> c;
	string s;
  cin >> s;
  
  for(int i = 0; s[i]; i++)
  {
    if(i==c-1)
      cout << (char)(s[i]+32);
    else
      cout << s[i];
  }
}