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If you publish messages of type UInt16, subscribing with a string will just not work. ROS is strict on message data types. According to your question, you tried to import the data type uint16 which does not exist in std_msgs. The correct type is UInt16. Try:

from std_msgs.msg import UInt16

and change the line that creates the subscriber to:

rospy.Subscriber('Adc', UInt16, callback)

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