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.

Sentence: 'a couple of people that are playing wii'. How many words start with the letter 'p' in the sentence.
2

Sentence: 'a man at a restaurant smiling while preparing pizzas'. How many words start with the letter 'p' in the sentence.
2

Sentence: 'airplanes leave brightly colored contrails behind them in the sky'. How many words start with the letter 'b' in the sentence.

2