n = int(eval(input()))

s, t =input().split()

ans = []

for i in range(n):

  ans += s[i]

  ans += t[i]

print(("".join(ans)))
n = input()

s , t=input().split()

print(*[s + t for s, t in zip(s, t)],sep='')

n = int(eval(input()))
s, t = input().split()
ans = []
for i in range(n):
    ans += s[i]
    ans += t[i]
print(("".join(ans)))

n = input()
s, t = input().split()
print(*[s + t for s, t in zip(s, t)], sep="")

-n = int(eval(input())) +n = input() -ans = [] -for i in range(n): -    ans += s[i] -    ans += t[i] -print(("".join(ans))) +print(*[s + t for s, t in zip(s, t)], sep="")