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 close up view of a mans hands as he operates a smart phone'. How many words start with the letter 'c' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a close up of a dog standing on a rug'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a woman crossing a street in a cross walk'. How many words start with the letter 'a' in the sentence.

Ex Output:

3