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 pizza is in a box on a table outside'. Find frequency of the letter 'u'
1

Sentence: 'a red stop sign with street signs above it'. Find frequency of the letter 't'

5