import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

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);
        System.out.println(getMethod(n, a));
    }

    private static int getMethod(int n, int[] a) {
        int result = Integer.MAX_VALUE;
        int dif;
        for (int i = 0; i < n - 1; i++) {
           dif = a[i+1] - a[i];
            if(dif < result) result = dif;
        }
        return result;
    }
}