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

Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'
5

Sentence: 'a dog laying on the back of a boat in the water'. Find frequency of the letter 't'
4

Sentence: 'a neutral toned bathroom with double sinks and a shower tub combination'. Find frequency of the letter 'm'
2