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

Sentence: 'a skier in the midst of a jump'. Replace the letter 'm' with 'd' in the sentence.
a skier in the didst of a judp

Sentence: 'an old rusty car sits outside of an old building'. Replace the letter 'o' with 'r' in the sentence.
an rld rusty car sits rutside rf an rld building

Sentence: 'several umbrellas sitting open in front of a store'. Replace the letter 'r' with 'x' in the sentence.

sevexal umbxellas sitting open in fxont of a stoxe