bash-pure, 85 bytes

Result

AC

Duration

4530ms

Code [DL]

IFS=
f(){
read -N1 x
printf \\$[1/(~a&5),i=i%51+1,a=c[i]|=`printf %o \'$x`|a&1]
f
}
f

stdin

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                  K                               

stdout

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                  Q!!!!!!!!!!!!!!!!!U

stderr

/code.bash: line 4: 1/(~a&5),i=i%51+1,a=c[i]|=40|a&1: division by 0 (error token is "(~a&5),i=i%51+1,a=c[i]|=40|a&1")

strace