starry, 172 bytes

Result

AC

Duration

1025ms

Code [DL]

      +     +` + '  + +   +  ' ` , + + +* .   '  ` , + .   ` +   +       +    **   +           +    *    ' + *    `      +*          + +  * +*      +*    * +   +  *      +'

Disassembly

[[:push, 1],
 [:push, 0],
 [:label, 0],
 [:dup],
 [:jump, 1],
 [:swap],
 [:dup],
 [:rotate],
 [:jump, 2],
 [:label, 1],
 [:char_in],
 [:dup],
 [:dup],
 [:dup],
 [:+],
 [:char_out],
 [:jump, 3],
 [:label, 2],
 [:char_in],
 [:dup],
 [:char_out],
 [:label, 3],
 [:dup],
 [:rotate],
 [:push, 2],
 [:%],
 [:+],
 [:rotate],
 [:push, 6],
 [:%],
 [:jump, 4],
 [:dup],
 [:-],
 [:label, 4],
 [:push, 1],
 [:+],
 [:push, 5],
 [:dup],
 [:*],
 [:dup],
 [:+],
 [:push, 1],
 [:+],
 [:%],
 [:dup],
 [:rotate],
 [:*],
 [:push, 1],
 [:jump, 0]]

stdin

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                          K                       

stdout

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                          K@@@@@@@@@@@@@@@@@@@@@@ 

stderr

/root/starry.rb:65:in `run': undefined method `ord' for nil:NilClass (NoMethodError)
	from /root/starry.rb:13:in `run'
	from /root/starry.rb:154:in `<main>'

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffea53216d0 /* 9 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x560271888d70 /* 9 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/local/ruby-2.6.3/bin/ruby", ["/usr/local/ruby-2.6.3/bin/ruby", "/root/starry.rb", "/volume/CODE"], 0x560271d78068 /* 9 vars */) = 0
12    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=8, si_stime=6} ---
10    +++ exited with 1 +++