Mathematical Reasoning

Let \(a: \sim(p \wedge \sim r) \vee(\sim q \vee s)\) and \(b:(p \vee s) \leftrightarrow(q \wedge r)\).

If the truth values of \(p\) and \(q\) are true and that of \(r\) and \(s\) are false, then the truth values of \(a\) and \(b\) are respectively