node, 108 bytes

Result

AC

Duration

1562ms

Code [DL]

console.log((""+require('fs').readFileSync(0)).replace(/([^T]{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        
   K0000000000000000000000000000000000000T        

stderr

strace