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: 'there are people in chairs watching a projection screen'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'woman standing on the beach with a large sailboat behind her'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a red and white double decker bus parked in front of a building'. How many words start with the letter 'b' in the sentence.

Ex Output:

2