List years$\_$list is created with three integers read from input. Using list methods, initialize:

sum$\_$val with the sum of all the elements in years$\_$list.

count val with the number of occurrences of $7$ in years$\_$list.

max$\_$val with the largest element of years$\_$list.

len$\_$val with the length of years$\_$list.

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# Reads three values from input into years$\_$list

years$\_$list input $()),$ int $($input$)())$