python3, 64 bytes

Result

WA

Duration

853ms

Code [DL]

a,*b=open(0)
print(a*len(b)+f'{b[-1].rstrip():x<{a.find("T")}}')

stdin

                                 T                
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
      K                                           

stdout

                                 T                
                                 T                
                                 T                
                                 T                
                                 T                
                                 T                
                                 T                
                                 T                
      Kxxxxxxxxxxxxxxxxxxxxxxxxxx

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffdae5764c0 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/volume/CODE"], 0x55a810279d50 /* 7 vars */ <unfinished ...>
11    execve("/bin/cat", ["cat", "-"], 0x55a810279d38 /* 7 vars */) = 0
12    <... execve resumed> )            = 0
11    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=11, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=2, si_stime=0} ---
10    +++ exited with 0 +++