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 colorful kite flies over top a house'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a yellow fire hydrant is placed in the grass'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bowl of fruit with an apple citrus and a bunch of bananas hanging from a hook'. How many words start with the letter 'b' in the sentence.

Ex Output:

3