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

Ex Input:
Sentence: 'a herd of zebra grazing in a lush green field'. Replace the letter 'h' with 'j' in the sentence.

Ex Output:
a jerd of zebra grazing in a lusj green field

Ex Input:
Sentence: 'this is a seafood platter with lobster and corn on the cob'. Replace the letter 't' with 'z' in the sentence.

Ex Output:
zhis is a seafood plazzer wizh lobszer and corn on zhe cob

Ex Input:
Sentence: 'a lady blowing bubbles in a restaurant'. Replace the letter 't' with 'x' in the sentence.

Ex Output:
a lady blowing bubbles in a resxauranx