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

public class Solution {
    
    int max;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] a = new int[n];
        int[] data = 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 value = Math.abs(a[1] - a[0]);
        
        for(int j = 1; j<n; j++)
        {
            if(Math.abs(a[j] - a[j-1]) <= value)
            {
                value = Math.abs(a[j]-a[j-1]);
            }
        }
        
        System.out.println(value);
        
    }
}