Detailed Instructions: 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.
Problem:christmas came and as usual she received 77 gifts to put under the christmas tree . she wanted to make other kids happy so she sent 66 of her gifts to the orphanage downtown . how many gifts were left under their christmas tree ?
Solution:
11