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: 'this grizzly bear is standing in some shallow water'. How many words start with the letter 'g' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a clock tower atop a tall building with a lighting rod'. How many words start with the letter 'a' in the sentence.

Ex Output:
4


Ex Input:
Sentence: 'a person is standing by a stop sign in a rural area'. How many words start with the letter 'a' in the sentence.

Ex Output:

4