#!/usr/local/bin/python

import time

def t():
    print 'hit return to start ',
    raw_input()
    t0 = time.time()
    print 'hit return to stop ',
    raw_input()
    t1 = time.time()
    print '%dm %ds' % (divmod (int(t1-t0), 60))

if __name__ == '__main__':
    while 1:
        t()