#!/bin/ruby

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

def min_abs(n, arr)
  arr.sort!
  diff = 10**9 + 1
  (n-1).times { |i| diff = (arr[i] - arr[i+1]).abs if (arr[i] - arr[i+1]).abs < diff }
  diff
end

puts min_abs(n, a)