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

Ex Input:
Sentence: 'four people are playing an interesting game in the park'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
four pxoplx arx playing an intxrxsting gamx in thx park

Ex Input:
Sentence: 'a person scooping from a large pot of soup on the stove into a soup bowl'. Replace the letter 'a' with 'x' in the sentence.

Ex Output:
x person scooping from x lxrge pot of soup on the stove into x soup bowl

Ex Input:
Sentence: 'a grill with steaks and pieces of pizza on it'. Replace the letter 't' with 'd' in the sentence.

Ex Output:
a grill widh sdeaks and pieces of pizza on id