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[] array = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            array[a_i] = in.nextInt();
        }
        
        Arrays.sort(array);
        int min = Integer.MAX_VALUE;
        for (int i = 0; i < n-1; i++)
            {
            if (Math.abs(array[i] - array[i+1]) < min)
                min = Math.abs(array[i] - array[i+1]);
            if (min == 0)
                break;
            }
        
        System.out.println(min);
    }
}