def solution():
    teams_n = int(input())
    team_l = []
    for i in range(teams_n):
        team_l.append(input())
    schedule = input()

    copies = {team_l[i] : team_l[i] for i in range(teams_n)}
    lenghs = {team_l[i] : len(team_l[i]) for i in range(teams_n)}

    for i in schedule:
        for j in range(teams_n):
            if i in team_l[j]:
                copies[team_l[j]] = copies[team_l[j]].replace(i, "")
            else:
                copies[team_l[j]] = team_l[j]
            if copies[team_l[j]] == '':
                print(lenghs[team_l[j]])
                return 0

    return 0


if __name__ == '__main__':
    solution()