#!/bin/python3

import sys

n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
a = sorted(a)
min = max(map(lambda x: abs(x), a))

for i in range(1, len(a)):
    diff = a[i] - a[i - 1]
    if diff < min:
        min = diff
print(min)