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 Ruby (2.3.3) (judge verdict: Wrong Answer)

3.times do |i|
	if i == 0
		N = gets.to_i
	elsif i == 1
		S = gets.to_s.chomp
	elsif i == 2
		K = gets.to_i
	end
end
i = 0
while i < N
	if S[K-1] == S[i]
	else
		S[i] = '*'
	end
	i += 1
end