#! /usr/bin/python

""" reads text from standard input and outputs any email addresses it
finds, one to a line.
"""

import re
from sys import stdin

# pat is a regular expression object with a pattern that approximates
# a valid email address
pat = re.compile(r'[-\w][-.\w]*@[-\w][-\w.]+[a-zA-Z]{2,4}')

# if you iterate over a file (eg stdin) you get a line at a time
for line in stdin:
    # findall(S) method returns a list matches of the re obj pattern to S
    for address in pat.findall(line):
        print address