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 fighter jet on a runway with a cover over the cockpit'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a vase filled with white flowers sitting on top of a wooden table'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'two guys playing tennis with another man watching'. How many words start with the letter 'p' in the sentence.

Ex Output:

1