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 and b finish the job in 15 days . while a , b and c can finish it in 11 days . c alone will finish the job in 
Options: a ) 41.25 days , b ) 30.25 days , c ) 60.25 days , d ) 71.25 days , e ) 51.25 days

Ex Output:
a


Ex Input:
Problem: when the perimeter of a regular polygon is divided by 5 , the length of a side is 25 . what is the name of the polygon ? what is the perimeter ? 
Options: ['a ) 125', 'b ) 126', 'c ) 127', 'd ) 128', 'e ) 129']

Ex Output:
a


Ex Input:
Problem: a person travels equal distances with speeds of 5 km / hr , 6 km / hr and 7 km / hr and takes a total time of 47 minutes . the total distance is ? 
Options: a ) 5 km , b ) 3 km , c ) 7 km , d ) 9 km , e ) 2 km

Ex Output:

a