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 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 boy standing on sand and flying a green kite'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a row of motorcycles parked next to each other'. How many words start with the letter 'n' in the sentence.

Ex Output:

1