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

Sentence: 'a girl riding a horse is jumping the log'. Replace the letter 'a' with 't' in the sentence.
t girl riding t horse is jumping the log

Sentence: 'a woman walks by with a large suitcase and a polka dot umbrella'. Replace the letter 'e' with 'n' in the sentence.
a woman walks by with a largn suitcasn and a polka dot umbrnlla

Sentence: 'an image of two people on the beach'. Replace the letter 'e' with 'g' in the sentence.

an imagg of two pgoplg on thg bgach