#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here
min=1000000000
diff=0
a.sort()
for i in xrange(n-1):
    diff = abs(a[i]-a[i+1])
    if min>diff:
        min=diff
            
print min