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

Example Input: Sentence: 'a man wearing a hat has his cell phone to his ear'. Replace the letter 'g' with 'w' in the sentence.
Example Output: a man wearinw a hat has his cell phone to his ear

Example Input: Sentence: 'a patio filled with white tables and chairs covered with umbrellas'. Replace the letter 'o' with 'e' in the sentence.
Example Output: a patie filled with white tables and chairs cevered with umbrellas

Example Input: Sentence: 'police officers riding on the back of horses'. Replace the letter 'r' with 'g' in the sentence.
Example Output:
police officegs giding on the back of hogses