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 little girl wearing silver shoes and a pink outfit standing in the rain holding a blue umbrella'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a person riding their mountain bike off road'. How many words start with the letter 'r' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man in a striped shirt is eating at a table'. How many words start with the letter 'm' in the sentence.

Ex Output:

1