#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
min=100000000000
for i in range(0,n):
    if(abs(a[i-1]-a[i])<min):    
        min=abs(a[i-1]-a[i])
               
print min