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

Q: Sentence: 'the small black and white dog holds onto a frisbee'. Find frequency of the letter 'h'

A: 3
****
Q: Sentence: 'a mixed bouquet of flowers in a glass vase set before a window'. Find frequency of the letter 'w'

A: 3
****
Q: Sentence: 'two men on a tennis court holding tennis rackets and competing'. Find frequency of the letter 'r'

A:
2
****