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();
        }
        int value = Integer.MAX_VALUE;
      Arrays.sort(a);
        for(int i=1;i<n;i++){
           if(Math.abs((a[i-1]-a[i])) < value)
                value = Math.abs((a[i-1]-a[i]));
        }
       System.out.println(value);
  }
}