#!/usr/bin/python3

import string

sum = 0
with open("input") as fh:
    groups = fh.read().split("\n\n")
    for g in groups:
        g = g.strip()
        g_yes = set(string.ascii_lowercase)
        for p in g.split("\n"):
            p_yes = set(p)
            g_yes = g_yes & p_yes
        sum += len(g_yes)
        print(g.replace("\n", "."), g_yes, sum)
print(sum)