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 dif = a[1] - a[0];
        
        for (int i = 2 ; i != a.length ; i++) {
            dif = Math.min(dif, a[i] - a[i - 1]);
        }
        
        System.out.println(dif);
    }
}