using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
class Solution {

    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
            string[] a_temp = Console.ReadLine().Split(' ');
            int[] a = Array.ConvertAll(a_temp, Int32.Parse);
            var minimumDifference = new MinimumAbsoluteDifference(a);
            var minimum = minimumDifference.GetMinimum();
            Console.WriteLine(minimum);
    }
}

class MinimumAbsoluteDifference
    {
        private int[] _array;

        public MinimumAbsoluteDifference(int[] array)
        {
            _array = array;
        }

        public int GetMinimum()
        {
            Array.Sort(_array);

            var minDifference = int.MaxValue;
            for (var i = 0; i < _array.Length - 1; i++)
            {
                var difference = Math.Abs(_array[i] - _array[i + 1]);
                if (difference == 0)
                    return difference;

                if (difference < minDifference)
                    minDifference = difference;
            }

            return minDifference;
        }
    }