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

Input: Consider Input: Sentence: 'a person that is sitting under an umbrella'. Replace the letter 'a' with 'l' in the sentence.

Output: l person thlt is sitting under ln umbrelll


Input: Consider Input: Sentence: 'a woman gives a thumbs up sign while sitting in front of a sandwich'. Replace the letter 's' with 'h' in the sentence.

Output: a woman giveh a thumbh up hign while hitting in front of a handwich


Input: Consider Input: Sentence: 'a bunch of cute birds are gathered on the sand'. Replace the letter 'e' with 'k' in the sentence.


Output: a bunch of cutk birds ark gathkrkd on thk sand