P9203 Time Limit “The Curse of Tsukiiwakasa”

The Hourai Elixir, a cursed elixir of immortality. Tsukiiwakasa, who was ordered to throw the Hourai Elixir into Mount Fuji to destroy it, eventually planned to throw the Hourai Elixir into the Yatsugatake Mountains instead. On the way down the mountain, Mokou kicked it down the slope and seized the Hourai Elixir. That was already a thousand years ago.

The times at which two events happened on the timeline can be viewed as two real numbers $a, b$. We say the two events satisfy the “anniversary” relation if and only if we can make them equal by performing the following two operations (possibly $0$ times): - Add $1$ to $a$, i.e., $a \gets a + 1$. - Add $1$ to $b$, i.e., $b \gets b + 1$. Now you are given real numbers $a, b$. Determine whether they satisfy “anniversary”.

The input consists of one line with two real numbers $a, b$. The input is given with exactly $12$ digits after the decimal point.

Output one line. If a valid way exists, output $\verb!YES!$; otherwise output $\verb!NO!$.

For all testdata, it is guaranteed that $0 < a, b \le 10^9$. Translated by ChatGPT 5