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

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 = Integer.MAX_VALUE;
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        Arrays.sort(a);
        // your code goes here
        for(int i=1; i<a.length; i++){
                int t = Math.abs(a[i] - a[i-1]);
                if(min> t){
                    min = t;
                }
                if(min < 1){
                    break;
                }
        }
        System.out.println(min);
    }
}