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

Input: Consider Input: Sentence: 'a train traveling through a dark tunnel next to green brush.'. Replace the letter 'r' with 'e' in the sentence.

Output: a teain teaveling theough a daek tunnel next to geeen beush.


Input: Consider Input: Sentence: 'a close up of a grassy beach showing an umbrella and wind board'. Replace the letter 'a' with 'f' in the sentence.

Output: f close up of f grfssy befch showing fn umbrellf fnd wind bofrd


Input: Consider Input: Sentence: 'a plate of food: meat, noodles, sprouts, carrots and salad'. Replace the letter 'm' with 'w' in the sentence.


Output: a plate of food: weat, noodles, sprouts, carrots and salad