N = int(input())
A = [input() for _ in range(N)]
M = int(input())
B = [input() for _ in range(M)]

G = {s: set() for a in A for s in a}
first_dict = {s: True for s in G.keys()}

for a in A:
    for i in range(len(a) - 1):
        G[a[i]].add(a[i + 1])
        first_dict[a[i + 1]] = False
for b in B:
    for i in range(len(b) - 1):
        G[b[i]].add(b[i + 1])
        first_dict[b[i + 1]] = False


def is_impossible(b):
    if b:
        print(-1)
        exit()


first = [k for k, v in first_dict.items() if v]
is_impossible(len(first) != 1)

cur = first[0]
ans = cur
for _ in range(len(G) - 1):
    is_impossible(len(G[cur]) != 1)
    cur = G[cur].pop()
    ans += cur
print(ans)