htms, 192 bytes

Result

AC

Duration

1462ms

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=>m.replace(/./g,"K"))</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    
             KKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKT    

stderr

strace