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 time laps photo of a city street'. How many words start with the letter 'o' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a person kneeling down under a green umbrella'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a decorated vase in front of some abstract sphere art'. How many words start with the letter 's' in the sentence.

Ex Output:

2