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: 'stuffed monkey surrounded by bananas with a bunch on his head'. How many words start with the letter 'b' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a huge stainless steel cooking range with a hood in a salesroom'. How many words start with the letter 's' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a puppy by an office chair wearing a tie'. How many words start with the letter 'a' in the sentence.

Ex Output:

3