#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
# your code goes here
#a.sort()
#for x in range
#max(abs(i) for i in [5, -2, -6, 5])
a.sort()
z = list()
for x in range(len(a)-1):
    z += [a[x+1]-a[x]]
print (min(z))