#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
currmin = 1000000000
a = sorted(a)
for i in xrange(n-1):
    if a[i+1] - a[i] < currmin:
        currmin = a[i+1] - a[i]

print currmin