from time_stamp import TimeStamp


def main(input_1, input_2):
    result = []
    ts = TimeStamp()
    result.append(None)
    for i in range(1, len(input_1)):
        if input_1[i] == "get_value":
            res = ts.get_value(input_2[i][0], input_2[i][1])
            result.append(res)
        if input_1[i] == "set_value":
            ts.set_value(input_2[i][0], input_2[i][1], input_2[i][2])
            result.append(None)

    return result