Problem:
Score : 200 points

Problem Statement

You are given a string S of length N consisting of lowercase English letters, and an integer K.
Print the string obtained by replacing every character in S that differs from the K-th character of S, with *.

Constraints

1 \leq K \leq N\leq 10

S is a string of length N consisting of lowercase English letters.

N and K are integers.

Input

Input is given from Standard Input in the following format:

N
S
K

Output

Print the string obtained by replacing every character in S that differs from the K-th character of S, with *.

Sample Input 1

5
error
2

Sample Output 1

*rr*r

The second character of S is r. When we replace every character in error that differs from r with *, we get the string *rr*r.

Sample Input 2

6
eleven
5

Sample Output 2

e*e*e*

Sample Input 3

9
education
7

Sample Output 3

******i**

Solution in Rust (1.15.1) (judge verdict: Accepted)

use std::io::stdin;
use std::time::SystemTime;

fn main() {
    let n: u64 = read().parse().unwrap();
    let s = read();
    let k: usize = read().parse().unwrap();
    
    let s: Vec<char> = s.chars().collect();
    let t = s[k - 1];
    for v in s {
        if v == t {
            print!("{}", v)
        } else {
            print!("*")
        }
    }
    println!("")
}

fn read() -> String {
    let mut s = String::new();
    stdin().read_line(&mut s).unwrap();
    s.trim().to_string()
}