import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        TreeSet<Integer> set = new TreeSet<>();
        for (int i = 0; i < n; i++) {
            set.add(sc.nextInt());
        }
        if (set.size() == 0) {
            System.out.println(0);
        }
        int prev = Integer.MIN_VALUE / 10;
        int min = Integer.MAX_VALUE;
        for (int x : set) {
            min = Math.min(min, x - prev);
            prev = x;
        }
        System.out.println(min);
    }
}