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

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
class Solution {

    public static void main(String args[]) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        Vector<Integer> list = new Vector<Integer>();
        for (int i = 0; i < N; i++) {
            list.add(in.nextInt());
        }
        Collections.sort(list);
        int min = list.elementAt(1) - list.elementAt(0);
        for(int i = 2;i<list.size();i++){
            int diff = list.elementAt(i) - list.elementAt(i-1);
            if(diff < min){
                min = diff;
            }
        }

        // Write an action using System.out.println()
        // To debug: System.err.println("Debug messages...");
        System.err.println(list);
        System.out.println("" + min);
    }
}