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();
        }
        // your code goes here
        
        int MinAbs=Math.abs(a[0]-a[1]);
        if(MinAbs==0)
                    {System.out.println(MinAbs);
                    System.exit(0);
                    } 
        Arrays.sort(a);
        for(int i=0;i<n-1;i++){
            
            int j=i+1;
            {
                if(MinAbs>Math.abs(a[i]-a[j]))
                   { MinAbs=Math.abs(a[i]-a[j]);
                    if(MinAbs==0)
                    {System.out.println(MinAbs);
                    System.exit(0);
                    } 
                   }
                
            }   
        }
        
        System.out.println(MinAbs);
    }
}