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];
        ArrayList<Long> a=new ArrayList<Long>();
        for(int a_i=0; a_i < n; a_i++){
            a.add(in.nextLong());
        }
        // your code goes here
          Collections.sort(a);
      /* Initialize difference between two consecutive numbers to zero */
      long minimum = 1000000000L;

      for(int i = 0;i<(n-1); i++){
         long temp = Math.abs(a.get(i+1)-a.get(i));
         if (temp  <= minimum)
            minimum = temp;
      }

      /* Return the minimum difference */
      System.out.println(minimum);
    }
}