bash-busybox, 21 bytes

Result

WA

Duration

474ms

Code [DL]

a=$(cat -)
echo $a[3]

stdin

86 56 92
12 96 91
38 40 04
29 16 97

stdout

86 56 92 12 96 91 38 40 04 29 16 97[3]

stderr

strace