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

Ex Input:
Sentence: 'a group of people on a beach flying a kite'. Replace the letter 'p' with 'i' in the sentence.

Ex Output:
a groui of ieoile on a beach flying a kite


Ex Input:
Sentence: 'the man is skiing fast in the snow'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
the man is skiing fast in the snxw


Ex Input:
Sentence: 'several elephants marching off the bank of a river'. Replace the letter 'b' with 'd' in the sentence.

Ex Output:

several elephants marching off the dank of a river