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

Sentence: 'a teddy bear is sitting on a heart shaped patio chair outside'. Find frequency of the letter 'i'
6

Sentence: 'a river with a long dragon boat in it and rowers on the boat in sets of two, along with two other people'. Find frequency of the letter 'h'
4

Sentence: 'man lunges over to hit the tennis ball on the court'. Find frequency of the letter 't'

6