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 crowd of people on the street one of which is taking pictures with a cell phone'. How many words start with the letter 'o' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a green fire hydrant is in the middle of an open dirt hole in a construction area'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'beautiful bedroom has flowers on the bed with open drapes to let the light in'. How many words start with the letter 't' in the sentence.

Ex Output:

3