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

Ex Input:
Sentence: 'a safari setting at a zoo with two giraffes and a zebra'. Replace the letter 'n' with 'g' in the sentence.

Ex Output:
a safari settigg at a zoo with two giraffes agd a zebra


Ex Input:
Sentence: 'some tracks for a rail way system near a building'. Replace the letter 'a' with 'h' in the sentence.

Ex Output:
some trhcks for h rhil why system nehr h building


Ex Input:
Sentence: 'three baseball players are standing while a crowd watches'. Replace the letter 'h' with 'o' in the sentence.

Ex Output:

toree baseball players are standing woile a crowd watcoes