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

Sentence: 'two giraffes standing next to some trees'. Find frequency of the letter 'f'
2

Sentence: 'a dilapidated bench in a park under a tree'. Find frequency of the letter 'p'
2

Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'

5