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 road with a crosswalk in the middle of it'. How many words start with the letter 't' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a door is closed with a sign on it glass cover'. How many words start with the letter 'a' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'an electric train stands on the train tracks'. How many words start with the letter 't' in the sentence.

Ex Output:

4