In a class, six students $P,Q,R,S,T,U$ are the top six rank holders.
$R$ did not get the 4th rank.
$P$’s rank is higher than $U$’s and $R$’s but lower than $Q$’s.
Four students have ranks lower than $S$, and five students have ranks above $T$.
Who is ranked 5th in the class?