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: 'the pigeons are walking around in the park around the benches'. How many words start with the letter 'b' in the sentence.

Ex Output:
1


Ex Input:
Sentence: 'a bird sitting on the neck of a giraffe'. How many words start with the letter 'o' in the sentence.

Ex Output:
2


Ex Input:
Sentence: 'a picture of a wooden container with crosses on it'. How many words start with the letter 'o' in the sentence.

Ex Output:

2