Definition: You are given a math word problem and you are supposed to apply multiple mathematical operators 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.
Input: kevin collected toys to use as prizes at the fair . he collected 14 stuffed animals . he also collected 18 frisbees and several yo-yos . kevin has 50 prizes in all . how many yo-yos did kevin collect ?
Output:
18