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 (
	"fmt"
	"strings"
)

func ReplaceComma(length, targetNum int, targetStr string) string {
	splitTargetStr := strings.Split(targetStr, "")
	notReplaceStr := splitTargetStr[targetNum-1]
	for i, s := range splitTargetStr {
		if s != notReplaceStr {
			splitTargetStr[i] = "*"
		}
	}
	return strings.Join(splitTargetStr, "")
}

func main() {
	var n, k int
	var s string
	fmt.Scan(&n, &s, &k)

	fmt.Println(ReplaceComma(n, k, s))
}