#!/usr/bin/env python3

import collections
import sys

input_file = sys.argv[1]

with open(input_file) as fd:
    lines = [line.rstrip() for line in fd.readlines()]

connections = [tuple(line.split("-")) for line in lines]

codi: collections.defaultdict[str, set[str]] = collections.defaultdict(set)

for connection in connections:
    a, b = connection
    codi[a].add(b)
    codi[b].add(a)

threes: set[tuple[str, ...]] = set()
for connection in connections:
    a, b = connection
    ac, bc = codi[a], codi[b]
    iis = ac.intersection(bc)
    for i in iis:
        threel = [a, b, i]
        if not (a.startswith("t") or b.startswith("t") or i.startswith("t")):
            continue
        threel.sort()
        threes.add(tuple(threel))

for three in threes:
    print(three)

print(len(threes))
# 11011 too high (forgot starts with t)