#!/bin/ruby

n = gets.strip.to_i
a = gets.strip
a = a.split(' ').map(&:to_i)
# your code goes here

ary = a.sort  # nlogn

min = nil
0.upto(n-2) do |i|
    diff = ary[i+1] - ary[i]
    if min.nil? || min > diff
        min = diff
    end
end
    
puts min