#!/bin/python

import sys


n = int(raw_input().strip())
a = map(int, raw_input().strip().split(' '))
# your code goes here

#smallest_abs = 1e11
#for i in range(n-1):
#    for j in range(i+1, n):
#        current_abs = abs(a[i]-a[j])
#        if current_abs < smallest_abs:
#            smallest_abs = current_abs
                
#print smallest_abs

sorted_a = sorted(a)

smallest_abs = 1e20

for i in range(n-1):
    current_abs = abs(sorted_a[i] - sorted_a[i+1])
    if current_abs < smallest_abs:
        smallest_abs = current_abs
        
print smallest_abs