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 yellow and green train on a train track in a wooded area'. Find frequency of the letter 'o'

A: 4
****
Q: Sentence: 'there are some zebra in the picture '. Find frequency of the letter 's'

A:
1
****