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[] a = new int[n];
		for (int a_i = 0; a_i < n; a_i++) {
			a[a_i] = in.nextInt();
		}
		in.close();
		Arrays.sort(a);

		int minDiff = Integer.MAX_VALUE;
		for (int i = a.length - 1; i > 0; i--) {
			int j = a[i] - a[i - 1];
			if (j < minDiff) {
				minDiff = j;
			}
		}
		System.out.println(minDiff);
	}

}