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)

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}

fn get<T: std::str::FromStr + Clone>() -> T {
    let line = read_vec::<T>();
    line[0].clone()
}

fn main() {
    let n = get::<usize>();
    let chars = get::<String>();
    let mut string = Vec::<char>::with_capacity(n);
    for c in chars.chars() {
        string.push(c)
    }

    let k = get::<usize>();
    let c = string[k - 1];

    for x in 0..n {
        if string[x] == c {
            print!("{}", c)
        } else {
            print!("*")
        }
    }
    println!()
}