n = int(input())

inTeamsIndex = {elem: i for i, elem in enumerate("abcdefghjiklmnopq")}
inTeam = [0] * 17

for _ in range(n):
    for elem in input()[:]:
        index = inTeamsIndex[elem]
        inTeam[index] = 1

count = -1
for member in input()[:]:
    index = inTeamsIndex[member]
    if inTeam[index] == 1:
        count += 1
        inTeam[index] = 2
if count == -1:
    print(0)
else:
    print(count)