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 smiling woman sits at a table with a pizza and salad'. How many words start with the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a traffic light showing green signalstreet sign board is there'. How many words start with the letter 't' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a bus stops in order to pick up passengers'. How many words start with the letter 'p' in the sentence.

Ex Output:

2