Use themapfunction to find the length of each word in a phrase and return the values in a list.

The function will have an input of a string, and output a list of integers.

len_of_strings('Find the lenght of each word in this phrase') [4, 3, 6, 2, 4, 4, 2, 4, 6] 

I understand how to use map, but how do I return values as a list?