instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'vanity sitting atop a base with two doors and a mirror overhead'. Find frequency of the letter 'n'
answer:
3


question:
Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'
answer:
6


question:
Sentence: 'a train traveling along tracks next to a body of water'. Find frequency of the letter 'o'
answer:

4