Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.
Q: alexa is reading a nancy drew mystery . there are 95 pages in her book . she read 18 pages the first day . the next day alexa just could n't stop reading . she read 58 pages . how many pages does alexa have left to read ?
A:
19