n = int(input())
l = [input() for i in range(n)]
d = -1
for i in range(n):
if l[i] == '?':
d = i
s = "#" if d == 0 else l[d - 1][-1]
e = "#" if d == n - 1 else l[d + 1][0]
m = int(input())
for i in range(m):
a = input()
if a in l:
continue
if (a[0] == s or s == "#") and (a[-1] == e or e == "#"):
print(a)
break