#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))

min = 0
flag = 0
a = sorted(a)
for i in range(len(a)-1):
    if flag == 0:
        flag = 1
        min = abs(a[i]-a[i+1])
    if abs(a[i]-a[i+1]) < min:
        min = abs(a[i]-a[i+1])
print min
'''
for i in range(n):
    for j in range(i+1,n):
        if flag == 0:
            flag = 1
            min = abs(a[i]-a[j])
            continue
        if abs(a[i]-a[j])  < min:
            min = abs(a[i]-a[j])
           
print min
'''
# your code goes here