#!/usr/bin/ruby

$goal = 10.0

def doError msg
  STDERR.puts msg
  exit(-1)
end

#逆ポ評価
def evalans s
  s2 = []
  s.each do |a|
    case a
    when '+', '-', '*', '/'
      arg1 = s2.pop.to_f
      arg2 = s2.pop.to_f
      return nil if arg1 == nil || arg2 == nil
      s2.push(arg2 + arg1) if a=='+'
      s2.push(arg2 - arg1) if a=='-'
      s2.push(arg2 * arg1) if a=='*'
      s2.push(arg2 / arg1) if a=='/'
    else
      s2.push(a)
    end
  end
  return nil if s2.length != 1
  return s2[0]
end

# 逆ポ → 通常の式
def showans s
  s2 = []
  s.each do |a|
    case a
    when '+', '-', '*', '/'
      arg1 = s2.pop
      arg2 = s2.pop
      return nil if arg1 == nil || arg2 == nil
      s2.push('('+arg2.to_s + ' ' + a + ' ' + arg1.to_s+')')
    else
      s2.push(a)
    end
  end
  puts s2[0]
end


# 使用したオペレータ数と数値の配列が引数
def calc nops, digits
  if $ans.length == 7
    showans($ans) if evalans($ans) == $goal
    return
  end

  digits.length.times do |i|
    next if digits[i] == nil
    $ans.push(digits[i])
    digits[i] = nil
    calc nops, digits
    digits[i] = $ans.pop.to_s
  end
  if nops < 3
    ['+', '-', '*', '/'].each do |op|
      $ans.push(op)
      calc nops + 1, digits
      $ans.pop
    end
  end
end

$ans=[]
digits = []

while a = ARGV.shift do
  case a
  when /-goal/
    $goal = ARGV.shift.to_f
  else
    digits.push a
  end
end

doError "Please specify 4 digits." if digits.length != 4
calc 0, digits