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];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        Arrays.sort(a);
        int diff=Integer.MAX_VALUE;
        for (int i=1; i<a.length; i++) {
            if (diff > Math.abs(a[i]-a[i-1])) {
                diff = Math.abs(a[i]-a[i-1]);
                if (diff == 0) {
                    System.out.println(diff);
                    return;
                }
            }
        }
        System.out.println(diff);
    }
}