#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here

assert n == len(a)
assert n > 0

a = sorted(a)

out = a[-1] - a[0]

for a1, a2 in zip(a[0:], a[1:]):
    da = a2 - a1
    if da < out:
        out = da

print(out)