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.
Q: at the first day back in school her parents bought her different colored pens . if her parents bought her 56 pens and she gave 22 of those to her friends how many pens were left for her to use ?
A:
34