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

Ex Input:
Sentence: 'a city street at dusk time with traffic'. Replace the letter 'i' with 'm' in the sentence.

Ex Output:
a cmty street at dusk tmme wmth traffmc


Ex Input:
Sentence: 'a tennis racket is sitting in the middle of a tennis field'. Replace the letter 'i' with 'f' in the sentence.

Ex Output:
a tennfs racket fs sfttfng fn the mfddle of a tennfs ffeld


Ex Input:
Sentence: 'a variety of canoes at a canoe dock in the water'. Replace the letter 'a' with 'c' in the sentence.

Ex Output:

c vcriety of ccnoes ct c ccnoe dock in the wcter