n = gets.to_i
xs = gets.split.map(&:to_i).sort
ans = 10 ** 20
if n == 1
  ans = 0
else
  (0...n-1).each do |i|
    next if xs[i] == xs[i+1]
    ans = [(xs[i]-xs[i+1]).abs, ans].min
  end
end
if ans == 10 ** 20
  ans = 0
end
puts ans