#!/bin/python3

import sys
n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
a.sort() 
diff =100000000000000000000000
for i in range(0,n-1,1):
    if (a[i+1] - a[i] < diff):
          diff = a[i+1] - a[i]
print(diff)
# your code goes here