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 min = Integer.MAX_VALUE ;
        
        for(int i = 1 ; i < a.length ; i++){
            
            if(min > a[i] - a[i -1]){
                min = a[i] - a[i -1] ;
            }
            if(min == 0)
                break ;
            
        }
        
        System.out.println(min);
        
        
        // your code goes here
    }
}