instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman in yellow dress standing next to a horse'. Find frequency of the letter 'l'
answer:
2

question:
Sentence: 'a couple of people are sitting at a table'. Find frequency of the letter 'e'
answer:
5

question:
Sentence: 'the outdoor bench is surrounded by trees, flowers, and other greenery'. Find frequency of the letter 'n'
answer:
4