Print the number of items in a list on ubuntu terminal

[buttercup]

Hey all.
In return of a command, I have the following output on my ubuntu terminal.

Output:
tshark: Display filters were specified both with "-Y" and with additional command-line arguments.
21
        List of ARFCNs = 62 53
        List of ARFCNs = 62 60 58 57 55 54 53 52 51 50 49 25

I want a python code that prints the number of entries in the first list i.e. 2.
Please help.