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: 'dog playing frisbee on the beach with ocean in background'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'man looking up at the ceiling while holding a flip phone'. How many words start with the letter 'h' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bicycle parked on a bench next to a building'. How many words start with the letter 'a' in the sentence.

Ex Output:

3