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 clock tower sitting on the side of a walkway'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a close up of a baby with a tooth brush'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a woman standing in front of window next to a bug and a stop sign'. How many words start with the letter 's' in the sentence.

Ex Output:

3