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();
        }

        Arrays.sort(a);

        int min_abs = Integer.MAX_VALUE;
        for (int i = 0; i < n - 1; i++) {
            int current = Math.abs(a[i] - a[i + 1]);
            if (current < min_abs) {
                min_abs = current;
            }
        }

        System.out.println(min_abs);
    }
}