#!/bin/ruby

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

a.sort!
min_diff = 9999999999999

(0..n-2).each do |i|
    abs_diff = (a[i]-a[i+1]).abs
    min_diff = abs_diff if abs_diff < min_diff
end

puts min_diff