instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a softball player holding the bat on first base'. Find frequency of the letter 't'
answer:
4


question:
Sentence: 'supplies and tools are arranged on the floor with a hard hat and bag'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a large grey train inside of a train station'. Find frequency of the letter 'e'
answer:

3