Problem:
Score : 200 points

Problem Statement

Given are strings s and t of length N each, both consisting of lowercase English letters.

Let us form a new string by alternating the characters of S and the characters of T, as follows: the first character of S, the first character of T, the second character of S, the second character of T, ..., the N-th character of S, the N-th character of T. Print this new string.

Constraints

1 \leq N \leq 100

|S| = |T| = N

S and T are strings consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

N
S T

Output

Print the string formed.

Sample Input 1

2
ip cc

Sample Output 1

icpc

Sample Input 2

8
hmhmnknk uuuuuuuu

Sample Output 2

humuhumunukunuku

Sample Input 3

5
aaaaa aaaaa

Sample Output 3

aaaaaaaaaa

Solution in Pascal (FPC 2.6.2) (judge verdict: Wrong Answer)

var  i,n: integer;
sum: string;
a,b: array[1..100] of char;
begin
readln(n);
for i:=1 to n do readln(a[i]); for i:=1 to n do readln(b[i]);
for i:=1 to n do
sum:=sum+a[i]+b[i];
writeln(sum);
end.