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

Example Input: Sentence: 'two giraffe standing in an enclosure at the zoo next to a  tree'. Replace the letter 'n' with 'g' in the sentence.
Example Output: two giraffe stagdigg ig ag egclosure at the zoo gext to a  tree

Example Input: Sentence: 'vintage cartoon elephant and cartoon dog paper tags'. Replace the letter 'p' with 'r' in the sentence.
Example Output: vintage cartoon elerhant and cartoon dog rarer tags

Example Input: Sentence: 'two men are seen eating something standing on the street'. Replace the letter 's' with 'm' in the sentence.
Example Output:
two men are meen eating momething mtanding on the mtreet