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

public class Solution {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int[] nu = new int[n];
		for (int a_i = 0; a_i < n; a_i++) {
			nu[a_i] = in.nextInt();
		}
		Arrays.sort(nu);
		int min = Math.abs(nu[0] - nu[1]);
		for (int i = 1; i < nu.length; i++)
		{
			min = Math.min(min, Math.abs(nu[i - 1] - nu[i]));
		}
		System.out.println(min);
	}
}