Plotting graphs on a dumb (vt100) terminal 

You have a client who is a mathematician and wants you to write a program to plot graphs. Unfortunately, all he has is a vt100 (i.e. ASCII, non-graphic) terminal that connects to the department server. This terminal can display 41 lines of text at a time, and each line has 61 characters. Your graph plotting program must work on this setup.

Your current task is to write a program that plots only linear functions -- you need to see how graphs look on such a terminal, before proceeding further, Remembering that the equation for a linear function is y=ax + b, you see that you need two inputs a,b. You can assume that the range of x and y for which the function needs to be plotted are 0 <= x <= 6.0, and 0 <= y <= 40. Each point on the graph is marked with a "*" and the axes are marked with the characters "|" and "-" (see the sample output). The graph has 60 points, one for each non-zero value of x. Each point is rounded to the nearest character; e.g. y=4.51 for some x implies that a star be drawn corresponding to y=5. If a point is out of range (i.e. if y>40), the point can be ignored. For simplicity, all non-graph points are blanks (" ") in the output file. Any point that lies on an axis is not plotted.

Input 

The input has several lines. Each line has two floating point numbers a,b (a,b > 0). The last line has 0 0 and should not be processed.

Output 

Outputs are separated by 2 blank lines. Each output will be the plot of the line (corresponding to the input) on the 60x40 terminal. Note that each line in the plot, including the last one (the x-axis), has a newline at the end of it.

Sample Input  

10.0 1.0
0 0

Sample Output  

|                                      *                     
|                                     *                      
|                                    *                       
|                                   *                        
|                                  *                         
|                                 *                          
|                                *                           
|                               *                            
|                              *                             
|                             *                              
|                            *                               
|                           *                                
|                          *                                 
|                         *                                  
|                        *                                   
|                       *                                    
|                      *                                     
|                     *                                      
|                    *                                       
|                   *                                        
|                  *                                         
|                 *                                          
|                *                                           
|               *                                            
|              *                                             
|             *                                              
|            *                                               
|           *                                                
|          *                                                 
|         *                                                  
|        *                                                   
|       *                                                    
|      *                                                     
|     *                                                      
|    *                                                       
|   *                                                        
|  *                                                         
| *                                                          
|*                                                           
|                                                            
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