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 Input:
Sentence: 'people on a tour bus with half the top cut off'. How many words start with the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bed sitting in the corner of the room next to a wooden table'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two men are practicing tennis on the same side of the net'. How many words start with the letter 'o' in the sentence.

Ex Output:

2