p02830 AtCoder Beginner Contest 148 - Strings with the Same Length
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.

Examples

Input

2
ip cc


Output

icpc


Input

8
hmhmnknk uuuuuuuu


Output

humuhumunukunuku


Input

5
aaaaa aaaaa


Output

aaaaaaaaaa
```python
N = int(input())
S,T = input().split()

for n in range(N):
    print(S[n]+T[n],end='')

```