You will be given a definition of a task first, then some input of the task.
In this task, you need to replace a letter in the sentence with another given letter.

Sentence: 'there is a man on a skateboard standing at the top of a ramp'. Replace the letter 'e' with 'j' in the sentence.
Output:
thjrj is a man on a skatjboard standing at thj top of a ramp