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: 'young lady holding an umbrella while standing at a pond'. How many words start with the letter 'y' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'an orange and white scooter carrying two passengers drives down a wet street while the passenger of the scooter holds a purple umbrella'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a multicolored and designed vase with a handle and a curved form to the vase'. How many words start with the letter 'a' in the sentence.

Ex Output:

5