d-gdc, 146 bytes

Result

AC

Duration

946ms

Code [DL]

import std.stdio;void main(){int b=0;char[] c,d,e;for(c=readln.dup;e=readln.dup,e;d=e)write(c);for(;d[++b]-75;){}for(;c[b]-84;)++c[b++];write(c);}

stdin

                       T                          
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
            K                                     

stdout

                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
                       T                          
            !!!!!!!!!!!T                          

stderr

strace