maybelater, 153 bytes

Result

AC

Duration

1239ms

Code [DL]

i=x=z=0whene is 0{e=d=0}whend is0{i=i+1x=x+1b=p==x
c=z+b+orda[i-1]writechrc
if(c!=10)d=0}whenc is10x=0whenc is84p=i whenc is75z=1whenc is34z=0a=reada e=0

stdin

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stdout

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           K!!!!!!!!!!!!!!"                       

stderr

/root/MaybeLater/interpreter.js:403
		return val[0].charCodeAt(0);
		              ^

TypeError: Cannot read property 'charCodeAt' of undefined
    at eventaction (/root/MaybeLater/interpreter.js:403:17)
    at parseExpression (/root/MaybeLater/interpreter.js:62:10)
    at parseExpression (/root/MaybeLater/interpreter.js:26:10)
    at parseArithmatic (/root/MaybeLater/interpreter.js:176:14)
    at parseExpression (/root/MaybeLater/interpreter.js:41:10)
    at parseExpression (/root/MaybeLater/interpreter.js:26:10)
    at parseArithmatic (/root/MaybeLater/interpreter.js:176:14)
    at parseExpression (/root/MaybeLater/interpreter.js:41:10)
    at parseExpression (/root/MaybeLater/interpreter.js:26:10)
    at assignment (/root/MaybeLater/interpreter.js:217:13)

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc263f7630 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x55fd5e37fd70 /* 7 vars */) = 0
12    execve("/usr/bin/node", ["/usr/bin/node", "/root/MaybeLater/interpreter.js", "/volume/CODE"], 0x55fd5f064068 /* 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} ---
19    +++ exited with 0 +++
22    +++ exited with 0 +++
20    +++ exited with 0 +++
21    +++ exited with 0 +++
18    +++ exited with 1 +++
17    +++ exited with 1 +++
16    +++ exited with 1 +++
15    +++ exited with 1 +++
14    +++ exited with 1 +++
13    +++ exited with 1 +++
12    +++ exited with 1 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=1, si_utime=34, si_stime=4} ---
10    +++ exited with 1 +++