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();
        }
        // your code goes here
        Arrays.sort(a);
        int minDiff = 0;
        if(a.length > 1){
            minDiff  = Math.abs(a[0] - a[1]);;
            for(int i=1; i<n-1; i++){
                int diff = Math.abs(a[i] - a[i+1]);
                if(diff < minDiff){
                    minDiff = diff;
                }
            }
        }
        
        System.out.println(minDiff);
        
    }
}