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: 'two elephants with people riding on them next to block barriers'. How many words start with the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a woman in a white tshirt and black pants skiing down a small hill'. How many words start with the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a clean empty bathroom with blue tile a toilet and a bathtub'. How many words start with the letter 't' in the sentence.

Ex Output:

2