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 i=0; i < n; i++){
            a[i] = in.nextInt();
        }
        Arrays.sort(a);
        int min=a[1]-a[0];
        for(int i=2;i<n;i++){
            if(min>(a[i]-a[i-1])){
                min=(a[i]-a[i-1]);
            }
        }
        System.out.print(min);
    }
}