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

Q: Sentence: 'a man flying through the air on a bicycle'. Find frequency of the letter 'u'

A: 1
****
Q: Sentence: 'two giraffes, one standing and one laying down'. Find frequency of the letter 'g'

A: 3
****
Q: Sentence: 'several men having a conversation at a restaurant'. Find frequency of the letter 'n'

A:
5
****