import java.util.Arrays;
import java.util.Scanner;

/**
 * Created by aayush on 10-02-2017.
 */
public class Solution {
    public static void main(String[] args)
    {
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        int[] arr=new int[n];
        int min=Integer.MAX_VALUE;
        int x=0;
        int i=0;
        while(--n>=0)
        {
            arr[i]=in.nextInt();
            i++;
        }

        Arrays.sort(arr);

        for(int j=1;j<arr.length;j++)
        {
            x=Math.abs(arr[j-1]-arr[j]);
                if(min>x)
                {
                    min=x;
                }
        }
        System.out.println(min);
    }
}