#!/usr/bin/ruby

class Stack
  def initialize()
    @stack = [];
  end

  def push(value)
    @stack.push(value)
  end

  def pop()
    @stack.pop()
  end

  def peek()
    @stack.last()
  end

  def empty?()
    @stack.empty?()
  end
end

while gets
  priority = {"*" => 2, "/" => 2, "+" => 1, "-" => 1, "(" => 0, ")" => 0}
  input = $_
  output = ""
  stack = Stack.new()
  input.scan(/\d+|[\+\-\*\/\(\)]{1}?/).each{ |token|
    case token
    when "+","-","*","/"
      output << stack.pop() + " " while not stack.empty?() and priority[stack.peek()] >= priority[token]
      stack.push(token)
    when "("
      stack.push("(")
    when ")"
      output << stack.pop() + " " until stack.peek() == "("
      stack.pop()
    else
      output << token + " "
    end
  }

  output << stack.pop() + " " until stack.empty?()
  print output.strip + "\n"
end