project # while truemain program loop displayabacus(abacusnumberdisplaycontrols(commands input(''if commands ='quit'quit the programbreak elif commands isdecimal()set the abacus numberabacusnumber int(commandselsehandle increment/decrement commandsfor letter in commandsif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =' 'abacusnumber - elif letter =' 'abacusnumber + elif letter =';'abacusnumber -