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.

Input: Consider Input: Sentence: 'dusty train passing through a dry mountain valley'. How many words start with the letter 'd' in the sentence.

Output: 2

Input: Consider Input: Sentence: 'a kitchen filled with appliances and cooking utensils'. How many words start with the letter 'a' in the sentence.

Output: 3

Input: Consider Input: Sentence: 'a small bathroom with a toilet claw foot tub and wash basin in dolls house'. How many words start with the letter 'a' in the sentence.
Output: 3