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

[Q]: Sentence: 'two elephants facing each other touching trunks in an enclosure'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a group of people standing on grass with a train in the background'. Find frequency of the letter 'n'
[A]: 6


[Q]: Sentence: 'a man waits at the crosswalk with his bicycle'. Find frequency of the letter 'b'
[A]:
1