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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func readLine(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func main() {
	sc := bufio.NewScanner(os.Stdin)
	readLine(sc)
	s := readLine(sc)
	k, _ := strconv.Atoi(readLine(sc))

	t := []rune(s)[k-1]
	var res string
	for _, o := range s {
		if o == t {
			res += string(o)
		} else {
			res += string('*')
		}
	}
	fmt.Println(res)
}