Modify a Character Array

Problem Description

Read in $n$ consecutive characters, change the $k$-th character to a specified other character, and output the modified result.

Input Format

The first line contains a positive integer $n$ ($0\lt n \le 30$).

The second line contains a string of $n$ consecutive characters.

The third line contains an integer $k$ and a character $c$, meaning that the $k$-th character should be changed to $c$.

Output Format

Output the modified string.

Sample Input 1

15
congratulations
2 a

Sample Output 1

cangratulations

Sample Input 2

11
hello world
8 a

Sample Output 2

hello warld

Hint

The input string may contain whitespace, so you cannot read it directly with %s — use a line-reading function (e.g. gets/fgets/std::getline) instead.