#!/bin/python

import sys
import math

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

q = sorted(a)
min = sum([abs(z) for z in a])
for x in range(0,n):
    if x+1 < n:
        t = abs(q[x]-q[x+1])
        if t < min:
            min = t
"""
for x in range(0, n-1):
    for y in range(x+1,n):
        t = abs(a[x]-a[y])
        if t < min:
            min = t
"""
print min