instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a woman holds some baked goods at the convention'. Find frequency of the letter 'd'
answer:
3


question:
Sentence: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'
answer:
8


question:
Sentence: 'a double decker bus with a lot of people on board'. Find frequency of the letter 'l'
answer:

3