#!/usr/bin/python3

"""Slide strace -r timestamps to a sortable position"""

from __future__ import print_function

import sys


def main():
    """Main function"""

    prior_partition = None
    for line in sys.stdin:
        stripped_line = line.lstrip()
        current_partition = stripped_line.partition(' ')
        # sys.stderr.write('fred {} {}\n'.format(prior_partition, current_partition))
        if prior_partition is None:
            slid = '{} {}'.format(current_partition[0], 'N/A\n') # pylint: disable=unsubscriptable-object
            
        else:
            slid = '{} {}'.format(current_partition[0], prior_partition[2]) # pylint: disable=unsubscriptable-object
        sys.stdout.write(slid)
        prior_partition = current_partition
    sys.stdout.write('{} {}'.format(-1, current_partition[2]))


main()