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

Example Input: Sentence: 'a crowd watches as giraffes graze the tree tops at the zoo'. Replace the letter 't' with 'q' in the sentence.
Example Output: a crowd waqches as giraffes graze qhe qree qops aq qhe zoo

Example Input: Sentence: 'broccoli and cooked meat arranged on a plate'. Replace the letter 'c' with 'l' in the sentence.
Example Output: brolloli and looked meat arranged on a plate

Example Input: Sentence: 'a doughnut on a black and white plate next to a blue coffee cup'. Replace the letter 't' with 'g' in the sentence.
Example Output:
a doughnug on a black and whige plage nexg go a blue coffee cup