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 bathroom sink with two large sinks under a mirror'. How many words start with the letter 's' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'dog playing frisbee on the beach with ocean in background'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a zebra eating next to a bunch of oxs'. How many words start with the letter 'z' in the sentence.

Ex Output:

1