package no135;

import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		if (n == 0) {
			System.out.println(0);
			return;
		}
		Integer[] x = new Integer[n];
		for(int i=0;i<n;i++) {
			x[i] = sc.nextInt();
		}
		Arrays.sort(x);
		int ans = 1 << 29;
		for(int i=0;i<n-1;i++) {
			ans = Math.min(ans, x[i+1] - x[i]);
		}
		System.out.println(ans);
	}

}