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

Ex Input:
Sentence: 'a lonley giraffe is making a trek in the wild'. Replace the letter 'r' with 'h' in the sentence.

Ex Output:
a lonley gihaffe is making a thek in the wild


Ex Input:
Sentence: 'a person on a surfboard riding in ocean waves'. Replace the letter 's' with 'g' in the sentence.

Ex Output:
a pergon on a gurfboard riding in ocean waveg


Ex Input:
Sentence: 'a street sign in a foreign country'. Replace the letter 't' with 'g' in the sentence.

Ex Output:

a sgreeg sign in a foreign coungry