node, 94 bytes

Result

AC

Duration

1136ms

Code [DL]

a=require("fs").readFileSync(0);for(i=51;a[i++]!=117;)a[i]|=a[i-51]|a[i-1]&1;console.log(""+a)

stdin

                                    T             
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
K                                                 

stdout

                                    T             
                                    t             
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                                    t             
k!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!u             

stderr

strace