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: 'a well dressed man standing near his early bicycle'. Replace the letter 'e' with 'd' in the sentence.
a wdll drdssdd man standing ndar his darly bicycld

Sentence: 'a city street with a construction wall covered in posters'. Replace the letter 'i' with 'x' in the sentence.

a cxty street wxth a constructxon wall covered xn posters