japt, 27 bytes

Result

AC

Duration

912ms

Code [DL]

c_|(X=Z&4?0:-~X%51-51*Zu)<1

stdin

                                   T              
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                                                  
                            K                     

stdout

                                   U              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                                   !              
                            K!!!!!!!              

stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd9da03e70 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x562a458d8cf8 /* 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    execve("/usr/bin/node", ["/usr/bin/node", "/root/japt-cli.js", "/volume/CODE", "                                "...], 0x562a46c70a30 /* 7 vars */) = 0
16    +++ exited with 0 +++
15    +++ exited with 0 +++
17    +++ exited with 0 +++
14    +++ exited with 0 +++
13    +++ exited with 0 +++
18    +++ exited with 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=11, si_stime=2} ---
10    +++ exited with 0 +++