PROGRAMMING:Minimum difference
Given n numbers, please find out the two numbers with the smallest difference (absolute value of difference) and output the absolute value of their difference.
###Input format:
The first line of input contains an integer n.
The second line contains n positive integers separated by a space.
###Output format:
Output an integer to indicate the answer.
###Input sample 1:
```in
five
1 5 4 8 20
```
###Output sample 1:
```out
one
```
###Example 1 shows:
The two numbers with the smallest difference are 5 and 4, and the difference between them is 1.
###Input sample 2:
```in
five
9 3 6 1 3
```
###Output sample 2:
```out
0
```
###Example 2 shows:
There are two identical numbers 3, and the difference between them is 0.
###Scale and convention of evaluation case:
For all evaluation cases, 2 ≤ n ≤ 1000, each given integer is a positive integer not exceeding 10000.
answer：If there is no answer, please comment
###Input format:
The first line of input contains an integer n.
The second line contains n positive integers separated by a space.
###Output format:
Output an integer to indicate the answer.
###Input sample 1:
```in
five
1 5 4 8 20
```
###Output sample 1:
```out
one
```
###Example 1 shows:
The two numbers with the smallest difference are 5 and 4, and the difference between them is 1.
###Input sample 2:
```in
five
9 3 6 1 3
```
###Output sample 2:
```out
0
```
###Example 2 shows:
There are two identical numbers 3, and the difference between them is 0.
###Scale and convention of evaluation case:
For all evaluation cases, 2 ≤ n ≤ 1000, each given integer is a positive integer not exceeding 10000.
answer：If there is no answer, please comment