n = int(input())

s, t = input().split()



for i in range(n):

    print(s[i], t[i], sep="", end="")

print("")

n = int(input())

S, T = input().split()

print(*[s+t for s, t in zip(S, T)], sep="")

n = int(input())
s, t = input().split()
for i in range(n):
    print(s[i], t[i], sep="", end="")
print("")

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

-s, t = input().split() -for i in range(n): -    print(s[i], t[i], sep="", end="") -print("") +S, T = input().split() +print(*[s + t for s, t in zip(S, T)], sep="")