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 Fortran (gfortran v4.8.4) (judge verdict: Accepted)

implicit none
integer n,k,i,len
character(10) s

read(5,*) n
read(5,*) s
read(5,*) k

len=len_trim(s)

do i=1,len

if(s(i:i) .ne. s(k:k)) then
s(i:i)="*"
endif
enddo

write(6,*) s

end