node, 109 bytes

Result

AC

Duration

775ms

Code [DL]

console.log((""+require('fs').readFileSync(0)).replace(/([K\s]{50})./g,"$1T").replace(/(?<=K.*) (?=.*T)/g,0))

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     
K0000000000000000000000000000000000000000000T     

stderr

strace