In this task, you need to replace a letter in the sentence with another given letter.

Example Input: Sentence: 'the two zebras standing out in the field'. Replace the letter 'h' with 'i' in the sentence.
Example Output: tie two zebras standing out in tie field

Example Input: Sentence: 'a person on a snowboard does an air trick'. Replace the letter 'n' with 'o' in the sentence.
Example Output: a persoo oo a soowboard does ao air trick

Example Input: Sentence: 'two zebras grazing in a field during the day'. Replace the letter 'i' with 'z' in the sentence.
Example Output:
two zebras grazzng zn a fzeld durzng the day