In this task, you need to count the number of times the given letter appears in the given sentence.
--------
Question: Sentence: 'a mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'

Answer: 3


Question: Sentence: 'a white bathroom sink sitting next to a toilet'. Find frequency of the letter 'i'

Answer: 5


Question: Sentence: 'a child in red and black checkered pajamas watching tv'. Find frequency of the letter 'k'

Answer:
2