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: 'a bathroom sink and mirror with someone personal belongings on it'. How many words start with the letter 'p' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a person in a body of water with a surf board'. How many words start with the letter 'b' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'an orange and white cat sitting on a window sill'. How many words start with the letter 'w' in the sentence.

Ex Output:

2