#!/bin/python

import sys

n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
max_diff = 2000000000
b = sorted(a)
for i in range(n-1):
    diff = abs(b[i+1] - b[i])
    if diff<max_diff:
        max_diff = diff
print max_diff