#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a.sort()
min_abdf = abs(a[0]-a[1])

for i in range(1,n-1):
    if abs(a[i]-a[i+1]) < min_abdf:
        min_abdf = abs(a[i]-a[i+1])
print (min_abdf)