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 person is sitting in the grass on a motorcycle'. How many words start with the letter 'i' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a train station with a train sitting there waiting to be loaded'. How many words start with the letter 't' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'two black and silver switch blades on top of green khaki pants'. How many words start with the letter 't' in the sentence.

Ex Output:

2