triangularity, 199 bytes

Result

AC

Duration

755ms

Code [DL]

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........ReD........
.......D"T"s.......
......S@"k]]"......
....."n[stac"+.....
...."*b,a,x i"+....
..."')for d,c,"+...
..").ljust(x,'*"+..
."n(b)+c.rstrip("+.
"[(a+'\n')*le"+  Ee

stdin

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                               K                  

stdout

                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                                               T  
                               K****************

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffe9e859120 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x5589f78b7d80 /* 7 vars */) = 0
12    execve("/usr/bin/python3", ["/usr/bin/python3", "/root/Triangularity/Triangularit"..., "/volume/CODE"], 0x5589f901f090 /* 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} ---
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 +++