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

Sentence: 'two zebras feed on a plant through some wire mesh'. Find frequency of the letter 'o'
4

Sentence: 'a group of men standing around a table cutting a cake'. Find frequency of the letter 'g'
3

Sentence: 'a teddy bear is sitting on a heart shaped patio chair outside'. Find frequency of the letter 'i'

6