class IntcodeComputerKeyboardInput:

    def read(self):
        return input()


class IntcodeComputerRawInput:

    def __init__(self, inputs):
        self.inputs = inputs
        self.p = 0

    def read(self):
        result = self.inputs[self.p]
        self.p += 1
        return result


class IntcodeComputerQueueInput:

    def __init__(self, queue):
        self.queue = queue

    def read(self):
        return self.queue.get()