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

Example Input: Sentence: 'a lonley giraffe is making a trek in the wild'. Replace the letter 'r' with 'h' in the sentence.
Example Output: a lonley gihaffe is making a thek in the wild

Example Input: Sentence: 'a white kitchen with bottles and pots on the counter'. Replace the letter 'a' with 'p' in the sentence.
Example Output: p white kitchen with bottles pnd pots on the counter

Example Input: Sentence: 'a giraffe walking in its natural habitat on the savannah'. Replace the letter 't' with 'u' in the sentence.
Example Output:
a giraffe walking in ius nauural habiuau on uhe savannah