bash-pure, 30 bytes

Result

WA

Code [DL]

read -s -n 1 c
echo $((c+10))

stdin

8499980410012721523563053964106734978522073814899554899107614409700747000667450010588615513711399639

stdout

18

stderr

/bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8)

strace