n = int(eval(input()))

s, t = input().split()

print((''.join([s[i]+t[i] for i in range(n)])))
n=eval(input())

S,T=input().split()

print((''.join([s+t for s,t in zip(S,T)])))
n = int(eval(input()))
s, t = input().split()
print(("".join([s[i] + t[i] for i in range(n)])))

n = eval(input())
S, T = input().split()
print(("".join([s + t for s, t in zip(S, T)])))

-n = int(eval(input())) -s, t = input().split() -print(("".join([s[i] + t[i] for i in range(n)]))) +n = eval(input()) +S, T = input().split() +print(("".join([s + t for s, t in zip(S, T)])))