入力1

 Input Year
2019
 Year        2019 is not a leap year.

入力2

 Input Year
2020
 Year        2020 is a leap year.

入力3

 Input Year
2000
 Year        2000 is a leap year.

入力4

 Input Year
1900
 Year        1900 is not a leap year.

入力1 Input Year 2019 Year 2019 is not a leap year. 入力2 Input Year 2020 Year 2020 is a leap year. 入力3 Input Year 2000 Year 2000 is a leap year. 入力4 Input Year 1900 Year 1900 is not a leap year.