#!/bin/python

import sys
import math

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