xslt, 194 bytes

Result

AC

Duration

4467ms

Code [DL]

<stylesheet version="1.0" xmlns="http://www.w3.org/1999/XSL/Transform"><output method="text"/><template match="/"><value-of select="replace(input,'.+(.)(\1| ).+','$1')"/></template></stylesheet>

stdin

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381 661
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212 116
437 733
933 331
133 356
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988 658
866 673
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234 292
962 767
374 774
643 378

stdout

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stderr

strace

10    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffc99b3af10 /* 7 vars */) = 0
11    execve("/bin/cat", ["cat", "-"], 0x557aab125d00 /* 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/java", ["java", "-jar", "saxon9he.jar", "-xsl:preprocess.xsl", "-s:preprocess.xsl", "-o:/tmp/input.xml"], 0x557aab4fd090 /* 7 vars */) = 0
12    execve("/usr/bin/java", ["java", "-jar", "saxon9he.jar", "-xsl:preprocess.xsl", "-s:preprocess.xsl", "-o:/tmp/input.xml"], 0x7f01158e4f80 /* 8 vars */) = 0
12    --- SIGRT_2 {si_signo=SIGRT_2, si_code=SI_TKILL, si_pid=12, si_uid=0} ---
12    --- SIGRT_2 {si_signo=SIGRT_2, si_code=SI_TKILL, si_pid=12, si_uid=0} ---
13    --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} ---
13    --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x14} ---
13    --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x14} ---
23    +++ exited with 0 +++
17    +++ exited with 0 +++
14    +++ exited with 0 +++
13    +++ exited with 0 +++
24    +++ exited with 0 +++
22    +++ exited with 0 +++
21    +++ exited with 0 +++
20    +++ exited with 0 +++
19    +++ exited with 0 +++
18    +++ exited with 0 +++
16    +++ exited with 0 +++
15    +++ 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=161, si_stime=38} ---
25    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x557aab125d18 /* 7 vars */) = 0
25    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=25, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
26    execve("/bin/ln", ["ln", "-sf", "/volume/CODE", "/tmp/code.xsl"], 0x557aab125d38 /* 7 vars */) = 0
26    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=26, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
27    execve("/usr/bin/java", ["java", "-jar", "saxon9he.jar", "-xsl:/tmp/code.xsl", "-s:/tmp/input.xml", "-o:/tmp/output"], 0x557aab4fd078 /* 7 vars */) = 0
27    execve("/usr/bin/java", ["java", "-jar", "saxon9he.jar", "-xsl:/tmp/code.xsl", "-s:/tmp/input.xml", "-o:/tmp/output"], 0x7f5fdc983f60 /* 8 vars */) = 0
27    --- SIGRT_2 {si_signo=SIGRT_2, si_code=SI_TKILL, si_pid=27, si_uid=0} ---
27    --- SIGRT_2 {si_signo=SIGRT_2, si_code=SI_TKILL, si_pid=27, si_uid=0} ---
28    --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=NULL} ---
38    +++ exited with 0 +++
32    +++ exited with 0 +++
29    +++ exited with 0 +++
28    +++ exited with 0 +++
39    +++ exited with 0 +++
35    +++ exited with 0 +++
37    +++ exited with 0 +++
30    +++ exited with 0 +++
36    +++ exited with 0 +++
34    +++ exited with 0 +++
33    +++ exited with 0 +++
31    +++ exited with 0 +++
27    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=27, si_uid=0, si_status=0, si_utime=156, si_stime=28} ---
40    execve("/bin/cat", ["cat", "/tmp/output"], 0x557aab125c98 /* 7 vars */) = 0
40    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=40, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
41    execve("/bin/rm", ["rm", "/tmp/input", "/tmp/input.xml", "/tmp/code.xsl", "/tmp/output"], 0x557aab4fd068 /* 7 vars */) = 0
41    +++ exited with 0 +++
10    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=41, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
10    +++ exited with 0 +++