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 couple of kids are sitting in the grass'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a couple of men shaking hands next to a wooden table'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'the plain has already taken off and in flight'. How many words start with the letter 'i' in the sentence.

Ex Output:

1