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 guy squatting down and tapping his food with a woman sitting down'. How many words start with the letter 'f' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'two adults and a child fly a kite at the beach'. How many words start with the letter 'a' in the sentence.

Ex Output:
5


Ex Input:
Sentence: 'a vase with a red rose a pink rose and white daisies'. How many words start with the letter 'a' in the sentence.

Ex Output:

4