In this task, you need to count the number of times the given letter appears in the given sentence.

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

A: 4
****
Q: Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'

A: 5
****
Q: Sentence: 'the giraffes are waiting for their food to arrive'. Find frequency of the letter 'r'

A:
6
****