n = int(eval(input()))

s, t =list(map(str, input().split()))

ans_list = [0] * n



for i in range(n):

  ans_list[i] = s[i] + t[i]



print(("".join(ans_list)))
n = int(eval(input()))

s, t =list(map(str, input().split()))

ans = ""



for i in range(n):

  ans += s[i]

  ans += t[i]



print(ans)
n = int(eval(input()))
s, t = list(map(str, input().split()))
ans_list = [0] * n
for i in range(n):
    ans_list[i] = s[i] + t[i]
print(("".join(ans_list)))

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

-ans_list = [0] * n +ans = "" -    ans_list[i] = s[i] + t[i] -print(("".join(ans_list))) +    ans += s[i] +    ans += t[i] +print(ans)