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

Sentence: 'a long row of tables displaying lots of fruit'. Find frequency of the letter 'o'
5

Sentence: 'a snowboarder making a jump of a snowy ledge'. Find frequency of the letter 'o'
4

Sentence: 'a mand and a woman tossing frisbees into a net'. Find frequency of the letter 's'
4