#!/usr/bin/env python3

import sys
import networkx as nx


if __name__ == '__main__':
    pcs = [line.strip('\n').split('-') for line in open(sys.argv[1])]
    
    d = {}
    t = set([])
    for con in pcs:
        if con[0] in d:
            d[con[0]].append(con[1])
        else: d[con[0]] = [con[1]]
        if con[0].startswith('t'): t.add(con[0])
        if con[1].startswith('t'): t.add(con[1])
    G = nx.Graph(d)
        
    res1 = 0
    for clique in nx.enumerate_all_cliques(G):
        if len(clique) == 3 and len(set(clique).intersection(t)) > 0: res1 += 1
        if len(clique) == 4: break
    res2 = ','.join(sorted(sorted([c for c in nx.find_cliques(G)],key=len, reverse=True)[0]))

    # challenge 1
    print(f"challenge 1:\n{res1}\n")

    # challenge 2
    print(f"challenge 2:\n{res2}")