Convert Year to Century

Write a function that takes a year and returns its corresponding century.

Examples

century_from_year(2005) ➞ 21

century_from_year(1950) ➞ 20

century_from_year(1900) ➞ 19

Notes

For guidance on the year boundaries for each century:

• The 19th century are the years from 1801 to 1900.
• The 20th century are the years from 1901 to 2000.