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

Ex Input:
Sentence: 'a man is standing on a snowboard, atop a mountain'. Replace the letter 'd' with 'u' in the sentence.

Ex Output:
a man is stanuing on a snowboaru, atop a mountain


Ex Input:
Sentence: 'a table with three different plates and several drinks on it'. Replace the letter 't' with 'x' in the sentence.

Ex Output:
a xable wixh xhree differenx plaxes and several drinks on ix


Ex Input:
Sentence: 'a pristine doctors examining room waiting for the next patient'. Replace the letter 'r' with 'h' in the sentence.

Ex Output:

a phistine doctohs examining hoom waiting foh the next patient