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

Q: Sentence: 'a gray elephant is in a grassy field'. Find frequency of the letter 'e'

A: 3
****
Q: Sentence: 'a herd of zebra standing on top  of a grass covered field'. Find frequency of the letter 'e'

A: 5
****
Q: Sentence: 'a stop sign also has a 4 way sign below it'. Find frequency of the letter 'i'

A:
3
****