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

Q: Sentence: 'an image of a cautionary construction sign'. Find frequency of the letter 'a'

A: 5
****
Q: Sentence: 'a ready to eat pizza on a rack'. Find frequency of the letter 'r'

A: 2
****
Q: Sentence: 'a hitter and umpire standing at home plate during a baseball game'. Find frequency of the letter 't'

A:
5
****