Distance on a Number Line

Source: Phước Hưng OJ

Version: Phuoc Hung OJ Extended

Problem Statement

Given integer positions $a,b$ on a number line, calculate the non-negative distance between them.

Input

One line containing integers $a,b$.

Output

Print $|a-b|$.

Subtask

• Subtask 1 — 100 points: $-10^9\le a,b\le10^9$.

Example

Input

-3 5

Output

8

Explanation

The difference between positions $-3$ and $5$ is $-8$. Its absolute value is $8$, which is the distance to print.