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

Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'
4

Sentence: 'two little girls playing with a bat and a tennis ball'. Find frequency of the letter 'w'
2

Sentence: 'a colorful yellow bird is perched on a branch with leaves'. Find frequency of the letter 'v'

1