import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        int min,diff;
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        // your code goes here
        Arrays.sort(a);
        
         min =Math.abs(a[0]-a[1]);
        for(int i=0;i<n-1;i++){
            diff = Math.abs((a[i]-a[i+1]));
            //System.out.print(diff);
            if(diff<min){
                min = diff;
            }
        }
        System.out.println(min);
    }
}