import java.util.*;
import java.math.*;

public class Main {
    private static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        List<Integer> list = new ArrayList<>();
        int n = sc.nextInt();
        for (int i = 0;i < n;i++) {
            list.add(sc.nextInt());
        }
        Collections.sort(list);
        int ret = Integer.MAX_VALUE;
        int abs;
        for (int i = 1;i < n;i++) {
            abs = Math.abs(list.get(i)-list.get(i-1));
            if (abs != 0) ret = Math.min(ret, abs);
        }
        ret = ret==Integer.MAX_VALUE?0:ret;
        System.out.println(ret);
    }
}