rprogn, 105 bytes

Result

WA

Duration

476ms

Code [DL]

read "\d" split "v1" =
read "\d" split "v2" =
read "\d" split "v3" =
read "\d" split "v4" =

v1 2 index p

stdin

21 28 72
58 54 46
14 02 37
09 82 30

stdout

--------------------
MEMORY DUMP
--------------------
--------------------

stderr

/usr/bin/lua5.3: main.lua:1330: ERROR: "main.lua:508: attempt to perform 'n%0'" AT WORD 20, 'index'
stack traceback:
	[C]: in function 'error'
	main.lua:1330: in local 'stuff'
	main.lua:1356: in function 'rpn'
	main.lua:1374: in main chunk
	[C]: in ?

strace