#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
a.sort()
minnum = float('inf')
for idx in range(len(a) - 1):
    if abs(a[idx] - a[idx + 1]) < minnum:
        minnum = abs(a[idx] - a[idx + 1])
print minnum