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

Ex Input:
Sentence: 'two kids sitting on a  child's bed and smiling'. Replace the letter 't' with 's' in the sentence.

Ex Output:
swo kids sissing on a  child's bed and smiling


Ex Input:
Sentence: 'a herd of cattle standing on a lush green field'. Replace the letter 'g' with 'f' in the sentence.

Ex Output:
a herd of cattle standinf on a lush freen field


Ex Input:
Sentence: 'a toddler on skis being held up by a grownup'. Replace the letter 'o' with 'k' in the sentence.

Ex Output:

a tkddler kn skis being held up by a grkwnup