instruction:
In this task, you need to count the number of times the given letter appears in the given sentence.
question:
Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'
answer:
5


question:
Sentence: 'two metal  benches on an empty train platform'. Find frequency of the letter 'n'
answer:
4


question:
Sentence: 'a painting of a person taking a hot dog out of a jar'. Find frequency of the letter 'f'
answer:

2