import java.io.*;
import java.util.*;
public class abs{

    public static void main(String[] args) {
	int min;
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] types = new int[n];
      int[] b= new int[n];
        for(int i=0;i < n;i++)
	{
           types[i]=in.nextInt();
	}
    for (int i = 0;i<n;i++)
       {
           for (int j =i+1;j<n; j++)
            {
		for(int k=i;k<=j;k++)
		{

 			b[k] =Math.abs(types[i])-Math.abs(types[j]);
		}
	    }
	}
min=getMinValue(b);
System.out.println(min);
}


public static int getMinValue(int[] b) {
    int minValue = b[0];
    for (int i = 1; i <b.length; i++) 
    {
        if (b[i] < minValue) 
	{
            minValue = b[i];
        }
    }
    return minValue;
}
}