#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a=sorted(a)
my_min=float('inf')
for i in range(n-1):
    if abs(a[i]-a[i+1]) < my_min:
        my_min=abs(a[i]-a[i+1])
print my_min