#!/bin/python3

import sys


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