Frequency count in pig

Hi,

My data is in format:

user_id,movie_id,timestamp
123, abc,unix_timestamp
123, def, ...
123, abc, ...
234, sda, ...

Now, I want to compute the number of times each movie is played in pig..
So the output I am expecting is:

123,abc,2
123,def,1
234,sda,1

and so on..
how do i do this in pig