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 woman standing next to another woman in front of a tv'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man without a shirt riding a skateboard'. How many words start with the letter 'r' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'man holding up a yellow cake with candles on the top of it'. How many words start with the letter 'w' in the sentence.

Ex Output:

1