In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'

Answer: 5


Question: Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'

Answer: 4


Question: Sentence: 'a man in glasses is playing a video game and a fireplace'. Find frequency of the letter 'd'

Answer:
2