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## A. Fractional Arithmetic

Time limit: 1.0 second
Memory limit: 64 MB
Your task is to write a program, which implements addition, subtraction, multiplication and division operations on fractions. Input and output fraction format is as follows:
• the sign of a number (must be written only if its absence may lead to misrepresentation of the number),
• the integer part of a number (the integer part that equals zero must be omitted if the numerator and the denominator are present),
• a space character (must be omitted if the integer or fractional part is absent),
• the numerator (if it is not equal to zero),
• the “/” sign (written only if there is a numerator),
• the denominator (must be omitted if there is no numerator),
• the denominator cannot be equal to zero.
Samples of fractional number representation: “-7 3/4”, “8 1/2”, “-7/11”, “0”, “11”.
Limitations
All limitations apply for both input and output data. The sign of a fraction: if the fraction is positive, the sign is not written; if the fraction is negative, the “-” sign must be present. The integer part and the numerator may have values ranging from 0 to 30000, the denominator may have values from 1 to 30000. The operation sign may be one of the four possible symbols: “+” (addition), “-” (subtraction), “*” (multiplication), “/” (division). The expression is always correct, so the second operand in the division operation cannot be zero.

### Input

The first line – a fraction (the first operand);
The second line – the sign of an operation;
The third line – a fraction (the second operand).
Both fractions may be reducible. The numerator is always less than the denominator.

### Output

A single line that contains an irreducible proper fraction (result) in the format described above.

### Sample

inputoutput
```-3 1/6
+
2/4
```
```-2 2/3
```
Problem Author: © Sergey G. Volchenkov, 2003(volchenkov@yandex.ru); Vladimir N. Pinaev, 2003(vpinaev@mail.ru; http://www.pic200x.chat.ru); Michael Y. Kopachev, 2003 (mkopachev@krista.ru).
Problem Source: 2003-2004 ACM Central Region of Russia Quarterfinal Programming Contest, Rybinsk, October 15-16, 2003
To submit the solution for this problem go to the Problem set: 1274. Fractional Arithmetic