instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'
answer:
4


question:
Sentence: 'a blue train on a track next to another track'. Find frequency of the letter 'c'
answer:
2


question:
Sentence: 'a line of people on a snowy field and trees all around'. Find frequency of the letter 'e'
answer:

6