1) Write a function named Countstr that operates over a list which includes a series of strings. The function takes a string and outputs the number of occurrences of that string in the given list. For example: Assume that dlist is a list that the user wants to search for the number of occurrences for the string "synth. dlist=["synthetic","polymer," synthesizer,"abaqus, "python","synths,"macro"] The function that you prepare will search for synth in each element of the list. The string synth has 3 occurrences in the list ["synthetic, polymer,"synthesizer, abaqus,"python,"synths,"macro"). Then it will report the number of occurrences as follows: The string synth has 3 occurrences in the list ["synthetic, polymer, synthesizer, abaqus, python, synths,macro]