import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
A=[input() for _ in range(n)]
m=int(input())
B=[input() for _ in range(m)]
S=[]
for a in A:
	S.append(a[0])
SS=[]
for b in B:
	if b[0] in S:
		SS.append(b[0])

if len(SS)!=1:
	print(-1)
else:
	s=SS[0]
	ans=""
	for a in A:
		if a[0]==s:
			ans+=a
			A.remove(a)
			break
	while A:
		t=ans[-1]
		for b in B:
			if t in b:
				ind=b.find(t)
				if ind==len(b)-1:
					print(-1)
					sys.exit()
				else:
					next=b[ind+1]
					for a in A:
						if a[0]==next:
							ans+=a
							A.remove(a)
							break
					else:
						print(-1)
						sys.exit()
	print(ans)