#!/bin/python


# your code goes here
import sys


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

absdif = sys.maxint
for i in range(len(a) - 1):
    absdif = min(absdif, abs(a[i]-a[i+1]))
                
print(absdif)