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

Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'
1

Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'
1

Sentence: 'a bird sitting on the back of a giraffe next to a tree'. Find frequency of the letter 'i'

4