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

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: 'a girl sitting in a chair eating a slice of pizza'. Replace the letter 'i' with 'x' in the sentence.
Example Output: a gxrl sxttxng xn a chaxr eatxng a slxce of pxzza

Example Input: Sentence: 'a boat traveling in the water near a castle, clock tower and a bridge'. Replace the letter 'h' with 'y' in the sentence.
Example Output:
a boat traveling in tye water near a castle, clock tower and a bridge