Score : 200 points
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.
Input is given from Standard Input in the following format:
N S T
Print the string formed.
2 ip cc
icpc
8 hmhmnknk uuuuuuuu
humuhumunukunuku
5 aaaaa aaaaa
aaaaaaaaaa