bash-busybox, 70 bytes

Result

WA

Duration

1383ms

Code [DL]

sed '1h
1!{$!g
${x
:1
/T /{s/T /T/;x;s/K /K/;x}
t1
x
:2
s/K /KK/
t2}}'

stdin

                                    T             
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                          K                       

stdout

stderr

sed: unterminated {

strace