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: 'two giraffes are walking down a rocky path'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a flat screen tv with an image of a baseball player holding a baseball bat'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'several young boys setting on a bench watching a little league baseball game'. How many words start with the letter 's' in the sentence.

Ex Output:

2