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 person takes a picture of a reflection in a mirror in the dark'. How many words start with the letter 'p' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a guy squatting down and tapping his food with a woman sitting down'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a traffic sign is displayed on a street'. How many words start with the letter 't' in the sentence.

Ex Output:

1