import sequtils,strutils
var
    N,M,i,j,n,m : int
    S1,S2       : seq[string]
    s           : string
    len_A       : int
N = stdin.readline.parseInt
S1 = @[]
for i in 1..N:
    s = stdin.readline
    S1.add(s)
M = stdin.readline.parseInt
S2 = @[]
for i in 1..M:
    s = stdin.readline
    S2.add(s)

len_A = 0
for s2 in S1:
    len_A += s2.len
var SA : string
var sc : seq[char]
sc = @[]
for s in S1:
    sc.add(s[0])
proc solve1 =
    var sc2 : seq[char]
    var SA2 = repeat('#',len_A).join
    sc2 = @[]
    for s in S2:
        if s[0] in sc:
            sc2.add(s[0])
            if sc2.len > 1:
                echo -1
                return
    for i,c in sc:
        if c == sc2[0]:
            j = i
            break
    SA2[0..S1[j].len-1] = S1[j]
    S2 &= S1
    for i in 0..<len_A:
        for s in S2:
            if s[0] == SA2[i]:
                SA2[i..(i + s.len - 1)] = s
    echo SA2
    return
solve1()