Sorting a Vector of Rational Numbers

1. Modify your previous exercise of CRational vector, so that after reading a vector of rational numbers, the vector is sorted in descending order.
2. For the input

   
   1/2
   1/3
   1/4
   1/5
   2/3
   2/5
   
   

   The output should be

   
   2/3
   1/2
   2/5
   1/3
   1/4
   1/5