Time |

Let a time point be given as 6 integers
*y*, *m*, *d*, *h*, *min*, *s* where
1970 <= *y* < 2030,
0 < *m* < 13,
0 < *d* < 32,
,
,
.
Write a program which computes how many
periods of a given length fit between two given time points. A period is given by a pair consisting of
a positive integer and a word expressing a time unit, i.e. `year` or `month` or `day` or `hour` or `minute`
or `second`. Every 4th year is a leap year, except every 100th which is not except every 400 year
which is. A length of the year varies according to leap years. The same is true for the month
February. Time units always start as usual, e.g., a year starts at 1st January, a month starts at its
1st day, a day starts at 0 hours 0 minutes 0 seconds, etc. A period ends after its last second.

1997 12 31 23 59 59 1998 1 1 0 0 0 1 second 2000 2 29 0 0 0 2000 2 29 23 59 59 1 day 2000 2 29 0 0 0 2000 3 1 0 0 0 24 hour 1996 12 31 20 30 0 1997 1 1 7 30 0 60 minute 1996 12 31 20 30 0 1997 1 1 7 30 0 1 hour

1 0 1 11 10