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];
        int [] diff = new int[n];
        int m=0,k=0,ind=0;
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = in.nextInt();
        }
        // your code goes here
        for(int a_i=0; a_i < n-1; a_i++){
            for(int a_j=a_i+1; a_j < n; a_j++){
                k=a[a_i]-a[a_j];
                m = Math.abs(k);
                diff[ind++]=m;
                
            }
        }
        int temp;
        for(int a_i=0; a_i < ind-1; a_i++){
            for(int a_j=a_i+1; a_j < ind; a_j++){
                if(diff[a_i]>diff[a_j]){
                   temp = diff[a_i];
                    diff[a_i]=diff[a_j];
                    diff[a_j]=diff[a_i];
                }
            }
        }
        System.out.println(diff[0]);
    }
    
}