Answer the question referring to the symbol-letter-number sequence given below:
P : 3 # R U 2 + > A P Y B 4
Q : S £ 5 N ⇔ F G 8 ∗ D 7 Y
R : O ∗ H T 6 @ C 9 Z K ⇔ 1
What is the difference between the total letters and total symbols, which are used in the series of P, Q and R?