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

Sentence: 'two sandwiches on whole wheat bread filled with meat slices, cheddar cheese slices, alfalfa sprouts and green leafy lettuce'. Replace the letter 'i' with 'x' in the sentence.
two sandwxches on whole wheat bread fxlled wxth meat slxces, cheddar cheese slxces, alfalfa sprouts and green leafy lettuce