Find if value exists in multiple lists

Question

I have 4 list and each element on the list are unique across the 4 list. How do I find if the value exist in one of the list and return which list it exist?

Example

Answer 1

If you don't want to use a list comprehension, you can always use a convoluted and verbose lambda expression!

list(filter(lambda x: value in x, [a,b,c,d]))

EDIT: Question was updated to ask for var name, not var value