#!/usr/bin/env python

"""Usage: %s Files...
"""

import sys, os, re

if len(sys.argv) < 2:
    print >> sys.stderr, __doc__ % (os.path.basename(sys.argv[0]))
    sys.exit(1)

r = re.compile('(?i)([A-Za-z0-9_]+@[A-Za-z0-9_]+\.(com|edu.cn))')

for fi in sys.argv[1:]:
    f = open(fi)
    lines = f.read()
    f.close()

    found = r.findall(lines)

    for s in found:
        print s[0]