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();
        }
        // your code goes here
        Arrays.sort(a);
        int minDiff = Integer.MAX_VALUE;
        for (int i = 0; i < n-1; ++i) {
            if (a[i+1] - a[i] < minDiff) {
                minDiff = a[i+1] - a[i];
            }
        }
        System.out.println(minDiff);
    }
}