Dictionary doctor_on_duty contains two key-value pairs read from input. In the try block, integer doctor_query is read from input. The key-value pair with doctor_query as the key in doctor_on_duty is output. Write an exception handler to: Catch a KeyError exception and bind excpt1 to the exception instance being caught. Output excpt1 followed by ' has no match.' on one line.

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Stack operations

A stack is a linear data structure that follows certain order to perform the operation; the order will be LIFO (Last In First Out) data structure. In the stack data structure elements/items are removed and added only from the top. The topmost stack item/element is pointed by the top pointer and the element which is added to the stack first will get deleted at the last.