lua, 109 bytes

Result

WA

Duration

697ms

Code [DL]

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

stdin

                            T                     
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
 K                                                

stdout

                            tttttttttttttttttttttt~

stderr

strace