rprogn, 93 bytes

Result

WA

Duration

489ms

Code [DL]

read "v1" =
read "v2" =
read "v3" =
read "v4" =

v1 0 index
v1 1 index
v1 2 index
v1 3 index

stdin

84 64 34
08 96 02
93 06 39
04 01 50

stdout

 
4
8
4

stderr

strace