GA Q10

Six students $\text{P, Q, R, S, T and U}$, with distinct heights, compare their heights and make the following observations. $\text{Observation I}$: $\text{S}$ is taller than $\text{R}$. $\text{Observation II}$: $\text{Q}$ is the shortest of all. $\text{Observation III}$: $\text{U}$ is taller than only one student. $\text{Observation IV}$: $\text{T}$ is taller than $\text{S}$ but is not the tallest The number of students that are taller than $\text{R}$ is the same as the number of students shorter than ____________.