#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort()
#print (a)
# your code goes here
minT=100000
for i in range(n-1):
    
        min1=abs(a[i]-a[i+1])
        #print(i,j)
        #print (min1)
        if (min1<=minT):
            minT=min1
            #print (minT)
print (minT)