Significance:
Transcription — copying the coding (sense) strand of DNA into mRNA by swapping thymine for uracil — is the literal first step of the Central Dogma (DNA → RNA → Protein), which gives this platform its name. Simulating it in code builds the mental model you'll need for every later problem involving RNA, splicing, or translation.
Statement
Given a DNA string representing the coding strand, produce the corresponding RNA string by replacing every `T` with `U`. All other characters remain unchanged and in the same order.