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 man touching a bird on top of a cage'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a couple of people are riding horses in a village'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'plates with blue leaves hold many food dishes including peas noodles broccoli and other things'. How many words start with the letter 'a' in the sentence.

Ex Output:

1