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

Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
u mun who is surfing in u wuve in the oceun

Sentence: 'giraffes behind a fence in the trees'. Replace the letter 'h' with 'l' in the sentence.
giraffes belind a fence in tle trees

Sentence: 'a man is parasailing out on the water'. Replace the letter 'a' with 'b' in the sentence.

b mbn is pbrbsbiling out on the wbter