#!/usr/bin/python

import sys

for x in sys.stdin.readlines():
    x = x.rstrip().decode('utf-8')
    if len(x) == 5:
        if x[2] == x[3] and x[2] == 'e':
            print x.encode('utf-8')


[chrivers@eos]~ #cat /usr/share/dict/american-english-huge | iconv -f latin1 | ./test.py
Greek
bleed
breed
cheek
cheep
cheer
creed
creek
creep
flees
fleet
freed
freer
frees
greed
green
greet
kneed
kneel
knees
preen
queen
queer
sheen
sheep
sheer
sheet
sleek
sleep
sleet
sneer
speed
steel
steep
steer
sweep
sweet
treed
trees
tweed
tweet
wheel