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 trio of women playing the nintendo wii at a showroom'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'a display of a variety of pizzas in a restaurant window'. How many words start with the letter 'd' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a cell phone sitting on the box it came in'. How many words start with the letter 'o' in the sentence.

Ex Output:

1