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 lone zebra standing in the middle of a field'. How many words start with the letter 'i' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'people on a tour bus with half the top cut off'. How many words start with the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a parrot sitting on top of someones fingers'. How many words start with the letter 's' in the sentence.

Ex Output:

2