TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a castle like bed room that has the era of templar knight similarities'. Find frequency of the letter 'm'

SOLUTION: 3

PROBLEM: Sentence: 'a man in costume talking on a cell phone'. Find frequency of the letter 'm'

SOLUTION: 2

PROBLEM: Sentence: 'a stop sign that is standing up in front of a yard'. Find frequency of the letter 'i'

SOLUTION:
4