You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Kelly had 56 apples . How many more apples does Kelly need to pick to have 105 apples altogether ?
[EX A]: 49

[EX Q]: There are 97 erasers in a box . Ernest has 17 erasers in a bag . Mark takes 97 erasers out of the box . How many erasers are left in the box ?
[EX A]: 0

[EX Q]: Sarah 's old washing machine could only wash 5 pieces of clothing at a time . If she had to wash 43 shirts and 2 sweaters how many loads would she have to do ?
[EX A]:
9