htms, 193 bytes

Result

AC

Duration

1551ms

Code [DL]

<htms id="htms"><q><code><q>eval</q></code><sub><q>constructor</q></sub><ins><q>return stdin.replace(/([^T]{50})./g,"$1T").replace(/K */,m=>"K".repeat(m.length))</q></ins><ins></ins></q></htms>

stdin

                          T                       
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
            K                                     

stdout

                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
                          T                       
            KKKKKKKKKKKKKKT                       

stderr

strace