#!/bin/python
import sys

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

min = 10**10
a = sorted(a)
for i in xrange(len(a) - 1):
    dif = abs(a[i] - a[i + 1])
    if dif < min:
        min = dif
    
print min