#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
m=sys.maxint+1
for i in range(0,len(a)-1):
    x=abs(a[i]-a[i+1])
    if(x<m):
        m=x
        
print m