from collections import deque



N = int(input())

S, T = input().split()



char = deque()



for i in range(N):

    char.append(S[i])

    char.append(T[i])



print(*char, sep='')

N = int(input())

S, T = input().split()

char = []



for i in range(N):

    char.append(S[i])

    char.append(T[i])



print(*char, sep='')

from collections import deque

N = int(input())
S, T = input().split()
char = deque()
for i in range(N):
    char.append(S[i])
    char.append(T[i])
print(*char, sep="")

N = int(input())
S, T = input().split()
char = []
for i in range(N):
    char.append(S[i])
    char.append(T[i])
print(*char, sep="")

-from collections import deque - -char = deque() +char = []