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

Sentence: 'the large modern train is on the train track'. Find frequency of the letter 'm'
1

Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'
1

Sentence: 'a woman standing on a peer overlooking the river'. Find frequency of the letter 'g'

2

