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

Ex Input:
Problem: a can finish a work in 12 days , b in 9 days and c in 2 days , b and c start the work but are forced to leave after 3 days . the remaining work was done by a in ?
Options: a ) 10 days , b ) 12 days , c ) 6 days , d ) 7 days , e ) 5 days

Ex Output:
e

Ex Input:
Problem: if 36 men can do a piece of work in 25 hours , in how many hours will 12 men do it ?
Options: a ) 22 , b ) 38 , c ) 60 , d ) 88 , e ) 75

Ex Output:
e

Ex Input:
Problem: if 24 men take 15 days to to complete a job , in how many days can 18 men finish that work ?
Options: a ) 20 , b ) 19 , c ) 18 , d ) 17 , e ) 16

Ex Output:
a