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

Sentence: 'there is an old stove with old pots on the burners'. Find frequency of the letter 't'
5

Sentence: 'a train station with a train pulling into the platform'. Find frequency of the letter 'i'
6

Sentence: 'a busy intersection with people and cars trying to move about'. Find frequency of the letter 't'

6