#!/bin/python

import sys


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

def abs_distance(i, j):
    dist = i- j
    return abs(dist)

min_abs = abs_distance(a[0], a[1])

a.sort()

for i in range(1,n):

    if (min_abs > abs_distance(a[i], a[i-1])):
        min_abs = abs_distance(a[i], a[i-1])

print min_abs