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a-b

Time Limit: 1000msMemory Limit: 256MB
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Problem Description

Given two numbers, output their difference.

Input Format

The first line contains two integers a and b, separated by a space. (−109≤a,b≤109)(-10^9 \le a, b \le 10^9)(−109≤a,b≤109).

Output Format

Output a single integer --- the answer.

Examples

Example 1
Input
25 20
Output
5
Example 2
Input
20 25
Output
-5

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