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 light shines on five clocks showing times in different zones'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a kitchen with a sink and a dish rack'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a ribbon has been tied around the branch of a tree'. How many words start with the letter 'a' in the sentence.

Ex Output:

3