In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Input: Consider Input: Problem: the product of two positive integers is 1023 and their difference is 2 . what is the bigger number ? 
Options: a ) 29 , b ) 31 , c ) 33 , d ) 35 , e ) 37

Output: c


Input: Consider Input: Problem: the ration of the father ’ s age to his son ’ s age is 7 : 3 . the product of their ages is 756 . the ratio of their ages after 6 years will be : 
Options: a ) 5 : 2 , b ) 2 : 1 , c ) 11 : 7 , d ) 13 : 9 , e ) none of these

Output: b


Input: Consider Input: Problem: what least number should be added to 1015 , so that the sum is completely divisible by 25 ? 
Options: a ) 4 , b ) 3 , c ) 2 , d ) 10 , e ) 5


Output: d