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.

Example Input: Sentence: 'a hotdog with onions on it is sitting on tinfoil'. How many words start with the letter 'o' in the sentence.
Example Output: 3

Example Input: Sentence: 'a box with three foot long hot dogs inside of it'. How many words start with the letter 'i' in the sentence.
Example Output: 2

Example Input: Sentence: 'a heard of sheep are grazing on the land'. How many words start with the letter 't' in the sentence.
Example Output:
1