instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'
answer:
4

question:
Sentence: 'a man riding on the back of a white horse next to other horses'. Find frequency of the letter 'o'
answer:
6

question:
Sentence: 'the boat is anchored beside a nearby bridge'. Find frequency of the letter 'e'
answer:
6