instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a group of cows that are standing in the grass'. Find frequency of the letter 'g'
answer:
3


question:
Sentence: 'a red fire hydrant opened and spilling water'. Find frequency of the letter 'd'
answer:
4


question:
Sentence: 'cell phone rest next to a cup on a saucer on the glass top table'. Find frequency of the letter 'e'
answer:

7