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 street sign above a faded stop sign'. How many words start with the letter 's' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a girl who is wearing a back pack with a teddy bear in it'. How many words start with the letter 'w' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman is seen in the background in a kitchen there are flowers on the counter'. How many words start with the letter 'i' in the sentence.

Ex Output:

3