You will be given a definition of a task first, then some input of the task.
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.

carla has some marbles . she bought 134 marbles . now she has 187 marbles . how many did she start with ?
Output:
53