Provide a user interface to look up the CPI values for any year. The program should read a year number from the keyboard and print out the list of CPI values for that year. After that, it should print out the average CPI for that year $($by computing the average of the reported list$).$

Enter query: $1950$

$[23\mathrm{.}5,23\mathrm{.}5,23\mathrm{.}6,23\mathrm{.}6,23\mathrm{.}7,23\mathrm{.}8,24\mathrm{.}1,24\mathrm{.}3,24\mathrm{.}4,24\mathrm{.}6,24\mathrm{.}7,25\mathrm{.}0]24\mathrm{.}066666666666666$

Enter query: $2000$

$[168\mathrm{.}8,169\mathrm{.}8,171\mathrm{.}2,171\mathrm{.}3,171\mathrm{.}5,172\mathrm{.}4,172\mathrm{.}8,172\mathrm{.}8,173\mathrm{.}7,174\mathrm{.}0,174\mathrm{.}1,174\mathrm{.}0]172\mathrm{.}19999999999996$

Enter query:

Enhance the program by allowing the user to specify the list of months they want to see. A valid query may in addition to the year number contain a list of month numbers separated by spaces.

For example, $19501357$ requests the data for January, March, May, and July of $1950.$ If the months are not specified, report full year. The average should be computed only for the reported months.

Enter query: $1950$

$[23\mathrm{.}5,23\mathrm{.}5,23\mathrm{.}6,23\mathrm{.}6,23\mathrm{.}7,23\mathrm{.}8,24\mathrm{.}1,24\mathrm{.}3,24\mathrm{.}4,24\mathrm{.}6,24\mathrm{.}7,25\mathrm{.}0]24\mathrm{.}066666666666666$

Enter query: $19501357$

$[23\mathrm{.}5,23\mathrm{.}6,23\mathrm{.}7,24\mathrm{.}1]23\mathrm{.}725$

Enter query: $195056$

$[23\mathrm{.}7,23\mathrm{.}8]23\mathrm{.}75$

Enter query: