#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
import sys

def minabs(arr):
    arr = sorted(arr)
    min = sys.maxint
    for i in xrange(len(arr) - 1):
        val = abs(arr[i] - arr[i+1])
        if val < min:
            min = val

    return min
print minabs(a)