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

Ex Input:
Sentence: 'a black velvety chair with chrome colored frame'. Replace the letter 'a' with 'z' in the sentence.

Ex Output:
z blzck velvety chzir with chrome colored frzme

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: 'an open bar b q sandwhich covered with sauce next to pickels and a drink'. Replace the letter 'n' with 'b' in the sentence.

Ex Output:
ab opeb bar b q sabdwhich covered with sauce bext to pickels abd a dribk