Some elements from the list are converted into int

Please tell me, is there a shorter way to convert the elements into the type int ?
Given, for example, the list a = ["2", "Hello", "3", "Hello"]
Is it possible to write the conversion shorter, but not like this:

 a [ 0 ] =  int  (a [ 0 ]) a [ 1 ] =  int  (a [ 1 ]) a [ 3 ] =  int  (a [ 3 ])   

The list is actually longer, I don't want to make such a column in the code.