Problems
Fractional arithmetic
Fractional arithmetic
Write a program that realizes the addition, subtraction, multiplication and division of fractions. Format fractions in the input and output data:
\begin{itemize}
\item Number sign (written only when it changes the number of absence);
\item Integer part of (zero integer part is not written, if the numerator and denominator);
\item Blank (not written, unless there is an entire or fractional part);
\item Numerator (if not zero);
\item Sign / (if the numerator);
\item Denominator (if the numerator).
\end{itemize}
Examples of representations of fractional numbers: \textbf{-7 3/4}, \textbf{8 1/2}, \textbf{-7/11}, \textbf{0}, \textbf{11}.
\InputFile
In the first line of input fraction (first operand), the second - a sign of operation ("+" - adds, "-" - subtract, "*" - multiplication, "/" - division) in the third line - fraction (second operand) . Both fractions can be reducible.
The integer part can take the value from the range 0 .. 30000, the numerator and denominator can take values from 1 to 30000, by dividing the second operand is not zero.
\OutputFile
In a single line displays an irreducible proper fraction (result) in the above format.
Input example #1
-3 1/6 + 2/4
Output example #1
-2 2/3