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

Q: Sentence: 'a couple of boys in a field playing baseball'. Find frequency of the letter 'i'

A: 3
****
Q: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'

A: 3
****
Q: Sentence: 'a little cow with yellow ear tags standing around in some hay'. Find frequency of the letter 'd'

A:
2
****