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

Q: Sentence: 'people playing wii bowling in a modern library'. Find frequency of the letter 'o'

A: 3
****
Q: Sentence: 'a woman swinging a tennis racquet towards a tennis ball'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'a tennis player hits the ball back to his opponent'. Find frequency of the letter 's'

A:
3
****