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: what is the remainder when 14,451 × 15,654 × 16,783 is divided by 5 ? 
Options: a ) 1 , b ) 3 , c ) 2 , d ) 4 , e ) 5

Ex Output:
c


Ex Input:
Problem: if a person walks at 20 km / hr instead of 10 km / hr , he would have walked 20 km more . the actual distance traveled by him is : 
Options: a ) 20 km , b ) 56 km , c ) 60 km , d ) 70 km , e ) 80 km

Ex Output:
a


Ex Input:
Problem: at a certain fruit stand , the price of each apple is 40 cents and the price of each orange is 60 cents . mary selects a total of 20 apples and oranges from the fruit stand , and the average ( arithmetic mean ) price of the 20 pieces of fruit is 56 cents . how many oranges must mary put back so that the average price of the pieces of fruit that she keeps is 52 cents ? 
Options: a ) 6 , b ) 7 , c ) 8 , d ) 9 , e ) 10

Ex Output:

e