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

Q: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'a red train traveling down train tracks near a forest'. Find frequency of the letter 'f'

A: 1
****
Q: Sentence: 'a man in a living room holding a remote control in his hand'. Find frequency of the letter 't'

A:
2
****