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);
        int min,temp;
        min=a[0]-a[1];
        min=(min>0)?min:-min;
        for(int i=1;i<n-1;i++)
            {
            temp=a[i]-a[i+1];
            temp=temp>0?temp:-temp;
            if(temp<min)
                min=temp;
        }
        System.out.println(min);
        // your code goes here
    }
}