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: total 85 matches are conducted in knockout match type . how many players will be participated in that tournament ? 
Options: a ) 85 , b ) 81 , c ) 53 , d ) 82 , e ) 84

Ex Output:
e


Ex Input:
Problem: a father said his son , ` ` i was as old as you are at present at the time of your birth . ` ` if the father age is 32 now , the son age 5 years back was 
Options: a ) 11 , b ) 17 , c ) 11 , d ) 19 , e ) 99

Ex Output:
a


Ex Input:
Problem: 108 ã — 108 + 92 ã — 92 = ? 
Options: a ) 20120 , b ) 11500 , c ) 20128 , d ) 20660 , e ) 20228

Ex Output:

c