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

Q: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'a man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

A: 2
****
Q: Sentence: 'a white toilet bowl next to a glass shower'. Find frequency of the letter 'e'

A:
4
****