#!/bin/python3

import sys


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