lua, 113 bytes

Result

AC

Duration

695ms

Code [DL]

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

stdin

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      K                                           

stdout

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      k!!!!!!!!!!!!!!!u

stderr

strace