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

Sentence: 'a gray colored pigeon that is perched on a railing outside of a building, with other buildings in the background'. Find frequency of the letter 'e'
7

Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'
3

Sentence: 'a giraffe bending down to get water from a watering hole'. Find frequency of the letter 'o'

4

