n = int(eval(input()))

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

u = ""

for i in range(n):

    u += s[i]

    u += t[i]

print(u)

n = int(eval(input()))

s, t = input().split()

ans = ""

for i in range(n):

    ans += s[i] + t[i]



print(ans)

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

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

-s, t = list(map(str, input().split())) -u = "" +s, t = input().split() +ans = "" -    u += s[i] -    u += t[i] -print(u) +    ans += s[i] + t[i] +print(ans)