import  funcs
r=[]
def add(a):
   r.append(a)
   return 'Successfully added '+a
def remove():
   if(len(r)>0):
      r.pop()
      return 'successfully POP'
   else:
      return "operation was not SuccessFul. this is Empty!!"
def size():
   return len(r)
def pick():
   return r[-1]
def show():
   return r
function_dict = {'add':add, 'remove':remove,'show':show,'pick':pick,'size':size}
funcs1=['add','remove','size','pick','show','quit']
var=1
#print(funcs1)
firstval=input('please type what you wanna do?')
while(var==1):
    if(firstval[0:3]=='add'):
        try:
            f=firstval.index(' ')
            valuee= firstval[f+1:]
            commandd=firstval[0:f]
        except:
                print("Your command is not Correct!!!  ")
    else:
        commandd=firstval
    if (commandd in funcs1):
        if(commandd=='add'):
          #  function_dict[commandd](valuee)
            print(function_dict[commandd](valuee))
        else:
           # function_dict[commandd]()
            print(function_dict[commandd]())

           # print(commandd())
    else:
        print("an error has occured the command "+commandd+" is not available")
    firstval = input('please type what you wanna do?')
    if(firstval=='quit'):
    var=0