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: 'an older airplane flies over the country side'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a living room filled with a brown chair and couch'. How many words start with the letter 'c' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a plate with broccoli potatoes and a meat with sauce arranged on it'. How many words start with the letter 's' in the sentence.

Ex Output:

1