Water dispenser

from collections import deque

people = deque()

liters = int(input())

while True:
    command = input()
    if command == 'Start':
        break
    name = command
    people.append(name)

while True:
    command = input()
    if command == 'End':
        break
    args = command.split()
    if len(args) > 1:
        quantity = int(args[1])
        liters += quantity
    else:
        quantity = int(args[0])
        if quantity <= liters:
            print(f'{people.popleft()} got water')
            liters -= quantity
        else:
            print(f'{people.popleft()} must wait')

print(f'{liters} liters left')