In Euclidean geometry, triangles can be divided into three types depending on the values of their angles. The triangle is acute if all its three angles are less than \textbf{90} degrees. The triangle is obtuse, if one of its angles is greater than \textbf{90} degrees. Finally, a triangle is right if one of its angles equals to \textbf{90} degrees. \InputFile Three positive integers \textbf{A},\textbf{ B}, \textbf{C}, separated with one space, are given in one line. They\textbf{ }are the lengths of triangle's sides. (\textbf{1 }≤\textbf{ A, B, C }≤\textbf{ 10000}) \OutputFile One of the words must be printed: \begin{itemize} \item "\textbf{IMPOSSIBLE}" -- if such triangle does not exist; \item "\textbf{ACUTE}" -- if the triangle is acute; \item "\textbf{OBTUSE}" -- if the triangle is obtuse; \item "\textbf{RIGHT}" -- if the triangle is right. \end{itemize}