#!/bin/python3

import sys


n = int(input().strip())
a = list(map(int, input().strip().split(' ')))
absMinimum = abs(max(min(a), max(a), key=abs))

#for i in range(n):
#    for j in range(n):
#        if abs(a[i] - a[j]) < absMinimum and j != i:
#            absMinimum = abs(a[i] - a[j])

#print(absMinimum)



a.sort()

for i in range(n-1):
    if abs(a[i]-a[i+1]) < absMinimum:
        absMinimum = abs(a[i]-a[i+1])

print(absMinimum)