instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'a yellow and green train on a train track in a wooded area'. Find frequency of the letter 'o'
answer:
4


question:
Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'
answer:
5


question:
Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'
answer:

5