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Implementation
Read one integer opcode from stdin.
Print its mnemonic:
1 -> PUSH, 2 -> ADD, 3 -> SUB, 4 -> PRINT, 5 -> HALT
For any other number print "UNKNOWN".
Why This Matters
This table is the skeleton of CPython's ceval.c dispatch loop and the JVM's interpreter, and Python's dis module performs exactly this opcode-to-name mapping when you disassemble a function. Every VM task that follows in this track plugs behavior into the numbers you just named.