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'.

Ex Input:
Problem: the difference of two numbers is 11 and one - fifth of their sum is 9 . find the numbers .
Options: a ) 28 and 17 , b ) 27 and 18 , c ) 25 and 15 , d ) 27 and 15 , e ) 25 and 18

Ex Output:
a

Ex Input:
Problem: which number can we add to 897326 to get a number exactly divisible by 456 ?
Options: a ) 58 , b ) 66 , c ) 74 , d ) 82 , e ) 90

Ex Output:
d

Ex Input:
Problem: a telephone company needs to create a set of 3 - digit area codes . the company is entitled to use only digits 6 , 4 and 3 , which can be repeated . if the product of the digits in the area code must be even , how many different codes can be created ?
Options: a ) 20 , b ) 22 , c ) 26 , d ) 24 , e ) 30

Ex Output:
c