reasonml, 155 bytes

Result

WA

Duration

989ms

Code [DL]

for (i in 0 to 31) {
  let a = Node.Fs.readFileSync("/dev/stdin", `utf8);
  if (a.[1] == a.[2]) {
    Js.log(a.[2]);
  } else {
    Js.log(a.[4]);
  };
};

stdin

529 691
373 572
248 844
188 881
527 991
489 647
143 897
742 244
289 388
994 938
266 356
862 259
344 212
727 824
855 751
179 982
822 775
179 599
822 526
216 334
388 898
792 997
413 339
983 334
344 557
599 932
617 172
364 665
856 526
838 117
996 961
977 779

stdout

stderr

  Warning number 35
  /tmp/code.re 1:1-8:1
  
  1 │ for (i in 0 to 31) {
  2 │   let a = Node.Fs.readFileSync("/dev/stdin", `utf8);
  . │ ...
  7 │   };
  8 │ };
  
  unused for-loop index i.
  internal/modules/cjs/loader.js:983
  throw err;
  ^

Error: Cannot find module 'bs-platform/lib/js/caml_string.js'
Require stack:
- /tmp/code.js
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:980:15)
    at Function.Module._load (internal/modules/cjs/loader.js:862:27)
    at Module.require (internal/modules/cjs/loader.js:1042:19)
    at require (internal/modules/cjs/helpers.js:77:18)
    at Object.<anonymous> (/tmp/code.js:5:19)
    at Module._compile (internal/modules/cjs/loader.js:1156:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1176:10)
    at Module.load (internal/modules/cjs/loader.js:1000:32)
    at Function.Module._load (internal/modules/cjs/loader.js:899:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/tmp/code.js' ]
}

strace

11    execve("/bin/sh", ["/bin/sh", "/root/script", "/volume/CODE"], 0x7ffd2eaf6b30 /* 9 vars */) = 0
12    execve("/usr/bin/realpath", ["realpath", "/volume/CODE"], 0x55eee8975d18 /* 9 vars */) = 0
12    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=12, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
13    execve("/bin/ln", ["ln", "-sf", "/volume/CODE", "/tmp/code.re"], 0x55eee8975d38 /* 9 vars */) = 0
13    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=13, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
14    execve("/usr/bin/bsc", ["/usr/bin/bsc", "/tmp/code.re"], 0x55eee8975d20 /* 9 vars */) = 0
14    execve("/bin/node", ["node", "/usr/bin/bsc", "/tmp/code.re"], 0x7ffdbdda69f0 /* 9 vars */) = -1 ENOENT (No such file or directory)
14    execve("/usr/local/sbin/node", ["node", "/usr/bin/bsc", "/tmp/code.re"], 0x7ffdbdda69f0 /* 9 vars */) = -1 ENOENT (No such file or directory)
14    execve("/usr/local/bin/node", ["node", "/usr/bin/bsc", "/tmp/code.re"], 0x7ffdbdda69f0 /* 9 vars */) = -1 ENOENT (No such file or directory)
14    execve("/usr/sbin/node", ["node", "/usr/bin/bsc", "/tmp/code.re"], 0x7ffdbdda69f0 /* 9 vars */) = -1 ENOENT (No such file or directory)
14    execve("/usr/bin/node", ["node", "/usr/bin/bsc", "/tmp/code.re"], 0x7ffdbdda69f0 /* 9 vars */) = 0
21    execve("/usr/lib/node_modules/bs-platform/linux/bsc.exe", ["/usr/lib/node_modules/bs-platfor"..., "/tmp/code.re"], 0x55a4df68af60 /* 9 vars */) = 0
22    execve("/bin/sh", ["sh", "-c", "/usr/lib/node_modules/bs-platfor"...], 0x7ffe11488110 /* 9 vars */) = 0
22    execve("/usr/lib/node_modules/bs-platform/linux/refmt.exe", ["/usr/lib/node_modules/bs-platfor"..., "--print=binary", "/tmp/code.re"], 0x563083c0e090 /* 9 vars */) = 0
22    +++ exited with 0 +++
21    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=22, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
21    +++ exited with 0 +++
14    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21, si_uid=0, si_status=0, si_utime=0, si_stime=1} ---
16    +++ exited with 0 +++
18    +++ exited with 0 +++
19    +++ exited with 0 +++
17    +++ exited with 0 +++
15    +++ exited with 0 +++
20    +++ exited with 0 +++
14    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=14, si_uid=0, si_status=0, si_utime=4, si_stime=2} ---
23    execve("/bin/cat", ["cat", "-"], 0x55eee8975d38 /* 9 vars */ <unfinished ...>
24    execve("/usr/bin/node", ["/usr/bin/node", "/tmp/code.js"], 0x55eee8975d48 /* 9 vars */ <unfinished ...>
23    <... execve resumed>)             = 0
24    <... execve resumed>)             = 0
23    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=23, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
26    +++ exited with 0 +++
29    +++ exited with 0 +++
28    +++ exited with 0 +++
27    +++ exited with 0 +++
25    +++ exited with 0 +++
30    +++ exited with 1 +++
24    +++ exited with 1 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=24, si_uid=0, si_status=1, si_utime=4, si_stime=0} ---
31    execve("/bin/rm", ["rm", "/tmp/code.js", "/tmp/code.re"], 0x55eee8975cf0 /* 9 vars */) = 0
31    +++ exited with 0 +++
11    --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=31, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
11    +++ exited with 0 +++