#! /usr/bin/env python3

import fileinput
import re
import sys

regex = re.compile(r"[ \t]+$")

try:
    for line in fileinput.input(inplace=True):
        sys.stdout.write(regex.sub("", line))
except OSError as e:
    sys.stderr.write(f"{e}\n")
    sys.exit(1)