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

[Q]: Sentence: 'seagulls sit on the posts of a seaside balcony by a clock tower'. Find frequency of the letter 'g'
[A]: 1


[Q]: Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'
[A]: 1


[Q]: Sentence: 'several men are standing on a path in a forest'. Find frequency of the letter 'f'
[A]:
1