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Background

Special for beginners, ^_^

Description

求 a 年 至 b 年间所有的闰年。

Format

Input

两个正整数 a 和 b。

Output

每行一个数字。

Samples

2000 2020

2000
2004
2008
2012
2016
2020

Limitation

所有数据 $1\le a \le b \le 10000$

50% 数据 $b-a \le 100$