In this task, you need to count the number of words in a sentence that start with the given letter. Answer with numbers and not words.

[EX Q]: Sentence: 'a silver and blue amtrak train sitting below tall buildings'. How many words start with the letter 'b' in the sentence.
[EX A]: 3

[EX Q]: Sentence: 'different cars on the streets in a city setting'. How many words start with the letter 'i' in the sentence.
[EX A]: 1

[EX Q]: Sentence: 'a group of skiers and snowboarders are gathered'. How many words start with the letter 'g' in the sentence.
[EX A]:
2