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

Q: Sentence: 'a castle like bed room that has the era of templar knight similarities'. Find frequency of the letter 'm'

A: 3
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Q: Sentence: 'a grey hummingbird by fence and tree branches'. Find frequency of the letter 'y'

A: 2
****
Q: Sentence: 'a cat sitting in front of a mirror looking at its reflection'. Find frequency of the letter 'r'

A:
5
****