N = int(input())

S, T = input().split()

L = [S[i]+T[i] for i in range(N)]

print(*L, sep="")

N = int(eval(input()))

S, T = input().split()

L = []

for i in range(2*N):

  if i&1:

    L.append(T[(i-1)//2])

  else:

    L.append(S[i//2])

print(("".join(L)))
N = int(input())
S, T = input().split()
L = [S[i] + T[i] for i in range(N)]
print(*L, sep="")

N = int(eval(input()))
S, T = input().split()
L = []
for i in range(2 * N):
    if i & 1:
        L.append(T[(i - 1) // 2])
    else:
        L.append(S[i // 2])
print(("".join(L)))

-N = int(input()) +N = int(eval(input())) -L = [S[i] + T[i] for i in range(N)] -print(*L, sep="") +L = [] +for i in range(2 * N): +    if i & 1: +        L.append(T[(i - 1) // 2]) +    else: +        L.append(S[i // 2]) +print(("".join(L)))