import java.util.* ;

class Infix {
  public static void main (String [] arg) {
    Stack<String> stack = new Stack<String> () ;
    for (int k = 0 ; k < arg.length ; k++) {
      String x = arg[k] ;
      if (x.equals("+") || x.equals("-") || x.equals("*") || x.equals("/")) {
	String i1 = stack.pop(), i2 = stack.pop() ;
	stack.push("(" + i2 + x + i1 + ")") ;
      } else {
	stack.push(x) ;
      }
      System.err.println(x + " -> " + stack) ;
    }
    System.out.println(stack.pop()) ;
  }
}