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

Sentence: 'a book shelf full of books and nick nacks '. Replace the letter 'o' with 'm' in the sentence.
a bmmk shelf full mf bmmks and nick nacks

Sentence: 'a baby is holding and eating a banana'. Replace the letter 'i' with 'g' in the sentence.
a baby gs holdgng and eatgng a banana

Sentence: 'a small bathroom with a sink, tub and toilet'. Replace the letter 'e' with 't' in the sentence.
a small bathroom with a sink, tub and toiltt