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

Q: willy has 1400 crayons . lucy has 290 crayons . how many more crayons does willy have then lucy ?

A: 1110
****
Q: belle collected 97 animal stickers . carolyn collected 18 fewer stickers than belle . how many stickers did carolyn collect ?

A: 79
****
Q: isabella 's hair is 18 inches long . by the end of the year her hair is 24 inches long . how much hair did she grow ?

A:
6
****