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 = 1000000, flag=1;
        for(int i=0; i< n-1 ; i++){
            int k = i + 1;
            if(a[i] == a[k]){
                flag=0;
                break;
            }
            int diff = Math.abs(a[i] - a[k]);
            if(diff < min) min = diff;
        }
        if(flag ==1)
            System.out.println(min);
        else
            System.out.println(0);
        // your code goes here
    }
}