Word challenge

word.py

import sys
from itertools import chain
telepad = [
    ["1"],
    ["2", "a", "b", "c"],
    ["3", "d", "e", "f"],
    ["4", "g", "h", "i" ],
    ["5", "j", "k", "l"],
    ["6", "m", "n", "o"],
    ["7", "p", "q", "r", "s"],
    ["8", "t", "u", "v"],
    ["9", "w", "x", "y", "z"],
]

contigous_sets = [set(chain(*telepad[i:i+3])) for i in range(len(telepad) - 3 + 1)]

for line in sys.stdin:
    word = line.strip()
    for set in contigous_sets:
        if all(l in set for l in word.lower()):
            print word
            break