jq, 92 bytes

Result

WA

Duration

757ms

Code [DL]

[inputs|sub("K +";"")]as$i|"\(.)
"*($i|length)+$i[-1]+"@"*((.|index("T"))-($i[-1]|length)+2)

stdin

                                        T         
                                                  
                                                  
                                                  
                                                  
                                                  
    K                                             

stdout

                                        T         
                                        T         
                                        T         
                                        T         
                                        T         
                                        T         
    @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc85a12570 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55e996653cf8 /* 7 vars */) = 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} ---
13    execve("/usr/bin/jq", ["/usr/bin/jq", "-rR", "-f", "/volume/CODE"], 0x55e997d89510 /* 7 vars */ <unfinished ...>
12    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    <... execve resumed> )            = 0
13    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=3, si_stime=0} ---
10    +++ exited with 0 +++