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 lady has just about finished her plate with a knife'. How many words start with the letter 'a' in the sentence.

Ex Output:
3


Ex Input:
Sentence: 'an old fashioned table lamp on a bed side table in a hotel'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a glass vase and some red roses on a sunny day'. How many words start with the letter 'o' in the sentence.

Ex Output:

1