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();

        int[] x = new int[n];

        for (int i = 0; i < n; i++) {
            x[i] = sc.nextInt();
        }

        Arrays.sort(x);

        if (x[0] == x[n-1]) {
            System.out.println(0);
            return;
        }

        int min = 1 << 29;

        for (int i = 0; i < n - 1; i++) {

            if (0 < (x[i + 1] - x[i])) {

                min = Math.min(min, x[i + 1] - x[i]);

            }

        }

        if (min == (1 << 29)) {
            min = 0;
        }

        System.out.println(min);

    }

}