#!/bin/python

import sys


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

a = list(sorted(a))

min_d = abs(a[-1] - a[0])

for i in xrange(n-1):
    min_d = min(min_d, a[i+1] - a[i])
    
print min_d