\\( \\operatorname{main} \\cdot p y \\) def mystery(data): \\( \\mathrm{s}=" n \\) for key in data: if \\( \\operatorname{key}[: 3]==" 356 " \\) : \\( s+=\\operatorname{data}[k e y] \\) \\( s+=" \\backslash n " \\) return \\( s \\) def \\( \\operatorname{main}(): \\) cs_books \\( =1 \\) "978-1163709267": "Databases", "356-2016709318": "Networking", "526-2957041211": "Programming Languages", "356-1342107619": "Operating Systems", "978-5226704519": "Algorithms", \\} result1 = mystery (cs_books) print (result 1 ) math_books \\( =\\{ \\) "356-7668029145": "Algebra", "978-9967907312": "Statistics", "356-6935324102": "Trigonometry", "978-2079590084": "Calculus I", "526-6007444175": "Calculus II", \\} result 2 = mystery (math_books) print (result2) \\( \\operatorname{ain}() \\)