Trees on the level |

Trees are fundamental in many branches of computer science. Current state-of-the art parallel computers such
as Thinking Machines' CM-5 are based on *fat trees*. Quad- and
octal-trees are fundamental to many algorithms in computer graphics.

This problem involves building and traversing binary trees.

Given a sequence of binary trees, you are to write a program that prints a level-order traversal of each tree. In this problem each node of a binary tree contains a positive integer and all binary trees have have fewer than 256 nodes.

In a *level-order* traversal of a tree, the data in all nodes at a
given level are printed in left-to-right order and all nodes at level
*k* are printed before all nodes at level *k*+1.

For example, a level order traversal of the tree

is: 5, 4, 8, 11, 13, 4, 7, 2, 1.

In this problem a binary tree is specified by a sequence of pairs
(*n*,*s*) where *n* is the value at the node whose path from the root is
given by the string *s*. A path is given be a sequence of *L*'s and
*R*'s where *L* indicates a left branch and *R* indicates a
right branch. In the tree diagrammed above, the node containing 13 is
specified by (13,RL), and the node containing 2 is specified by (2,LLR).
The root node is specified by (5,) where the empty string indicates the
path from the root to itself. A binary tree is considered to be
*completely specified* if every node on all root-to-node paths in
the tree is given a value exactly once.

The input is a sequence of binary trees specified as described above.
Each tree in a sequence consists of several pairs (*n*,*s*) as described
above separated by whitespace. The last entry in each tree is (). No
whitespace appears between left and right parentheses.

All nodes contain a positive integer. Every tree in the input will consist of at least one node and no more than 256 nodes. Input is terminated by end-of-file.

For each completely specified binary tree in the input file, the level order traversal of that tree should be printed. If a tree is not completely specified, i.e., some node in the tree is NOT given a value or a node is given a value more than once, then the string ``not complete'' should be printed.

(11,LL) (7,LLL) (8,R) (5,) (4,L) (13,RL) (2,LLR) (1,RRR) (4,RR) () (3,L) (4,R) ()

5 4 8 11 13 4 7 2 1 not complete