RPS Count

Alice and Bob play $10$ rounds of Rock (R) Paper (P) Scissors (S). It is known that each round had a winner. Bob played R, P, and S, respectively, $3,1,$ and $6$ times, while Alice played R, P, and S, respectively, $2,4,$ and $4$ times. How many wins did Bob have? If it is not possible to know the answer for sure, answer $-1$.