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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int [] a = new int[n];
        int i,j;
        for(i=0;i< n;i++)
            a[i] = sc.nextInt();
        
        
              Arrays.sort(a);

        
      int min=99999999;
        for(i=0;i<n-1;i++)
            {
          int k=Math.abs(a[i]-a[i+1]);
            if(k<min)
             min=k;
             }
        
        System.out.print(min);
        
       
    }
}