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

public class Solution {
    
    private static void minimunAbsDifference(int[] arr) {
        int minDiff = Integer.MAX_VALUE;
        Arrays.sort(arr);
        for(int i=0; i<arr.length - 1; i ++) {
            int diff = Math.abs(arr[i] - arr[i+1]);
            if (diff < minDiff) {
                minDiff = diff;
            }
        }
        System.out.println(minDiff);
    }
    
    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();
        }
        // your code goes here
        minimunAbsDifference(a);
    }
}