In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'

A: 4
****
Q: Sentence: 'a doorway looking into a small bathroom with white toilet'. Find frequency of the letter 'r'

A: 2
****
Q: Sentence: 'a large audience is attending a tennis game'. Find frequency of the letter 'd'

A:
2
****