## A Sequence Problem

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Points: 5 (partial)
Time limit: 2.0s
Memory limit: 64M

Author:
Problem type

Given a sequence of integers, , print the minimum value of for some . In other words, find the minimum difference between any integers in the sequence.

Note that is the absolute value function.

#### Input Specification

The first line will contain the integer .

The second line will contain integers, , the sequence of integers.

#### Output Specification

Print the minimum difference between any integers in the sequence.

#### Sample Input

5
1 5 3 9 2

#### Sample Output

1

#### Explanation for Sample Input

The minimum difference is .