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#!/usr/bin/env python
"""Prepends a relative timestamp to each input line from stdin and writes it to stdout."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import sys
import time
def main():
"""Main program entry point."""
start = time.time()
sys.stdin.reconfigure(errors='surrogateescape')
sys.stdout.reconfigure(errors='surrogateescape')
for line in sys.stdin:
seconds = time.time() - start
sys.stdout.write('%02d:%02d %s' % (seconds // 60, seconds % 60, line))
sys.stdout.flush()
if __name__ == '__main__':
main()
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