This program is a simulation of a toy robot moving on a square tabletop, of
dimensions 5 units x 5 units. There are no other obstructions on the table surface.
The robot is free to roam around the surface of the table, but must be prevented from
falling to destruction. Any movement that would result in the robot falling from the table
must be prevented, however further valid movement commands must still be allowed.

Create an application that can read in commands of the following form:

PLACE X,Y,F MOVE LEFT RIGHT REPORT

PLACE will put the toy robot on the table in position X,Y and facing NORTH, SOUTH,
EAST or WEST. The origin (0,0) can be considered to be the SOUTH WEST most
corner. The first valid command to the robot is a PLACE command, after that, any
sequence of commands may be issued, in any order, including another PLACE
command. The application should discard all commands in the sequence until a valid
PLACE command has been executed.

MOVE will move the toy robot one unit forward in the direction it is currently facing.

LEFT and RIGHT will rotate the robot 90 degrees in the specified direction without 
changing the position of the robot. . REPORT will
announce the X,Y and orientation of the robot.

A robot that is not on the table can choose to ignore the MOVE, LEFT, RIGHT and REPORT commands. 
Provide test data to exercise the application.

Constraints:
The toy robot must not fall off the table during movement. This also includes the initial
placement of the toy robot. Any move that would cause the robot to fall must be ignored.

Example Input and Output:
a) PLACE 0,0,NORTH MOVE REPORT Output: 0,1,NORTH
b) PLACE 0,0,NORTH LEFT REPORT Output: 0,0,WEST
c) PLACE 1,2,EAST MOVE MOVE LEFT MOVE REPORT Output: 3,3,NORTH

Deliverables:
The source files, the test data and any test code.
'''
class robot:
    def __init__(self):
        self.x = None
        self.y = None
        self.f = None
        self.placed = False
    def place(self,x,y,f):
        if 0 <= x <5 and 0 <= y < 5 and f in ['NORTH','SOUTH','EAST','WEST']:
            self.x = x
            self.y = y
            self.f = f
            self.placed = True
    def move(self):
        if not self.placed: return
        if self.f == "SOUTH" and self.y > 0:
            self.y -= 1
        elif self.f == "NORTH" and self.y < 4:
            self.y +=1
        elif self.f == "EAST" and self.x < 4:
            self.x += 1
        elif self.f == "WEST" and self.x > 0:
            self.x -= 1
    def left(self):
        if not self.placed: return
        if self.f == "SOUTH": self.f = "EAST"
        elif self.f == "EAST": self.f = "NORTH"
        elif self.f == "NORTH": self.f = "WEST"
        elif self.f == "WEST": self.f = "SOUTH"
    def right(self):
        if not self.placed: return
        if self.f == "SOUTH": self.f = "WEST"
        elif self.f == "WEST": self.f = "NORTH"
        elif self.f == "NORTH": self.f = "EAST"
        elif self.f == "EAST": self.f = "SOUTH"
    def report(self):
        print("{},{},{}".format(self.x,self.y,self.f))
    
r = robot()
komanda = input("Komande: ").split()
i = 0
while 1:
    if i >= len(komanda): break
    print(komanda[i])
    if komanda[i] == 'PLACE':
        x,y,f = komanda[i+1].split(',')
        r.place(int(x),int(y),f)
        i +=2
    elif komanda[i] == "LEFT":
        r.left()
        i+=1
    elif komanda[i] == "RIGHT":
        r.right()
        i += 1
    elif komanda[i] == "MOVE":
        r.move()
        i += 1
    elif komanda[i] == "REPORT":
        r.report()
        i += 1