Pokemon cards

You are comparing your Pokemon card collection with your friends. Each of you has several cards and you would like to know how many cards are there that you have in common with your first friend that your second friend doesn’t have.
The first line of the input contains your cards separated by a space. The second line contains space-separated cards of your first friend, while the third line contains the cards of your second friend in the same format.
The program should print a single number - the number of cards you have in common with your first friend that your second friend does not have.
Input
DetectivePikachu CosmicEclipse HiddenFates UnifiedMinds
TeamUp UnifiedMinds DetectivePikachu HiddenFates UnbrokenBonds
LostThunder DragonMajesty DetectivePikachu CosmicEclipse

Output
2
Cards that you have in common with your first friend that are not present in your second friend’s collection are:
  1. UnifiedMinds
  1. HiddenFates
 
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