#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))

diff = float("inf")
a.sort()

for i in range(1,len(a)):
    if diff ==  0:
        break
    if(a[i]-a[i-1] < diff):
        diff = a[i]-a[i-1]
print(diff)
    
    
    
# your code goes here