node, 93 bytes

Result

AC

Duration

775ms

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

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                               K                  

stdout

                                  T               
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                               k!!u               

stderr

strace