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

Ex Input:
Sentence: 'the child is throwing the frisbee through the hoop'. Replace the letter 't' with 'm' in the sentence.

Ex Output:
mhe child is mhrowing mhe frisbee mhrough mhe hoop

Ex Input:
Sentence: 'a white plate topped with a cut in half sandwich'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
a white plate txpped with a cut in half sandwich

Ex Input:
Sentence: 'two young men standing next to two dogs'. Replace the letter 'm' with 'j' in the sentence.

Ex Output:
two young jen standing next to two dogs