N=int(eval(input()))

S,T=(x for x in input().split())

alist=[]



for i in range(N):

  alist.append(S[i])

  alist.append(T[i])



o="".join(alist)

print(o)
N=int(eval(input()))

S,T=input().split()

l=[]

for i in range(N):

  l.append(S[i])

  l.append(T[i])

o="".join(l)

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

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

-S, T = (x for x in input().split()) -alist = [] +S, T = input().split() +l = [] -    alist.append(S[i]) -    alist.append(T[i]) -o = "".join(alist) +    l.append(S[i]) +    l.append(T[i]) +o = "".join(l)