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

Q: Sentence: 'a close up of a bird on the outside window sill'. Find frequency of the letter 'c'

A: 1
****
Q: Sentence: 'a crowd of people standing in front of a green train'. Find frequency of the letter 'g'

A: 2
****
Q: Sentence: 'a group of guys holding up there tennis rackets '. Find frequency of the letter 't'

A:
3
****