N = int(eval(input()))



S, T = input().split()



ans = ''

for i in range(N):

    ans += S[i]

    ans += T[i]



print(ans)

N = int(eval(input()))

S, T = input().split()



ans = []

for i in range(N):

    ans.append(S[i])

    ans.append(T[i])



print((''.join(ans)))

N = int(eval(input()))
S, T = input().split()
ans = ""
for i in range(N):
    ans += S[i]
    ans += T[i]
print(ans)

N = int(eval(input()))
S, T = input().split()
ans = []
for i in range(N):
    ans.append(S[i])
    ans.append(T[i])
print(("".join(ans)))

-ans = "" +ans = [] -    ans += S[i] -    ans += T[i] -print(ans) +    ans.append(S[i]) +    ans.append(T[i]) +print(("".join(ans)))