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: find the ones digit of 73 ^ 356 
Options: a ) 1 , b ) 5 , c ) 6 , d ) 7 , e ) 9

Ex Output:
a


Ex Input:
Problem: if [ x ] is the greatest integer less than or equal to x , what is the value of [ - 2.6 ] + [ 1.4 ] + [ 2.7 ] ? 
Options: a ) 0 , b ) 1 , c ) 2 , d ) 6 , e ) 7

Ex Output:
a


Ex Input:
Problem: the average of first six multiples of 4 is : 
Options: a ) 14 , b ) 9 , c ) 12 , d ) 15 , e ) 17

Ex Output:

a