lua, 110 bytes

Result

WA

Duration

706ms

Code [DL]

a=0
i=1
c={}while a<117 do
s=io.read(1)i=i%51+1
c[i]=(c[i]or0)|s:byte(1)a=c[i]|a&1
io.write(string.char(a))end

stdin

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                                         K        

stdout

stderr

/usr/bin/lua5.3: /volume/CODE:5: ')' expected near 'or0'

strace