#!/bin/python

import sys
from math import pow

n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
a.sort()
mn=int(pow(10,9))
for i in range(len(a)-1):
    x=abs(a[i]-a[i+1])
    if x<mn:
        mn=x
print mn