q = []


def length():
    """Returns number of waiting customers"""
    return len(q)

# %%

def show():
    """SHOW queue: print list of waiting customers. Customer waiting longest
    are shown at the end of the list."""
    print("Customers waiting are:")
    print(q)

# %%

def add(name):
    """Customer with name 'name' joining the queue"""
    q.append(name)


def next_  ():
    """Returns name of next customer to serve, removes customer from queue"""
    return q.pop(0)


# main programme starts here
add("Hawke")
add("Fangohr")
show()
print("Length of queue is {}".format(length()))
print("Next customer is {}".format(next_()))
print("Next customer is {}".format(next_()))
print("Length of queue is {}".format(length()))