You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

[EX Q]: Context: Rebecca wants to split a collection of eggs into groups of 20. Rebecca has 5 marbles and 12 eggs. 

 Question: How many more eggs does Rebecca have than marbles?
[EX A]: 7

[EX Q]: Context: A chef had 58 apples. After making some pies, he had used 35. 

 Question: How many apples remained?
[EX A]: 23

[EX Q]: Context: There were some birds sitting on the fence. 4 more birds came to join them. If there are a total of 5 birds on the fence now 

 Question: How many birds had been sitting on the fence at the start?
[EX A]:
1