#include <stdio.h>
#ifdef _WIN32
#include <fcntl.h>
#include <io.h>
#else
#include <unistd.h>
#include <poll.h>
#endif

int J;

#ifdef _WIN32
static int pk(void){int c=getchar();ungetc(c,stdin);return c==EOF;}
char Q(void){int c=getchar();J=pk();return c;}
#else
/* input is read here, not through stdio, so the end-of-input flag J never blocks.
   a client that keeps the pipe open (an editor talking to the language server) sends
   one message and waits for the answer: peeking for the next byte after the last
   one would wait for a message that comes only after the answer. so J is 1 only
   when the end is known, and 0 when more may come. the output is flushed before
   any read that can wait, for the same reason. */
static unsigned char ib[65536];
static int ip, in, ieof;
/* make a byte available. wait is 0 to look without waiting. returns 1 when one is ready */
static int fill(int wait)
{
	int n;
	if (ip < in) return 1;
	if (ieof) return 0;
	if (!wait) {
		struct pollfd f; f.fd = 0; f.events = POLLIN; f.revents = 0;
		if (poll(&f, 1, 0) <= 0) return 0;	/* nothing yet: not the end, not a byte */
	} else fflush(stdout);
	n = (int)read(0, ib, sizeof ib);
	if (n <= 0) { ieof = 1; return 0; }
	ip = 0; in = n;
	return 1;
}
static int pk(void) { if (ip < in) return 0; if (ieof) return 1; fill(0); return ieof; }
char Q(void)
{
	int c;
	if (!fill(1)) { J = 1; return (char)-1; }
	c = ib[ip++];
	J = pk();
	return (char)c;
}
#endif
void G(char c){putchar(c);}

static void init_io(void) {
#ifdef _WIN32
	_setmode(_fileno(stdin), _O_BINARY);
	_setmode(_fileno(stdout), _O_BINARY);
	J = pk();
#else
	J = pk();
#endif
}

#if defined(__GNUC__) || defined(__clang__)
__attribute__((constructor)) static void init(void) { init_io(); }
#elif defined(_MSC_VER)
#pragma section(".CRT$XCU", read)
static void __cdecl msc_init(void) { init_io(); }
__declspec(allocate(".CRT$XCU")) static void (__cdecl *msc_init_fn)(void) = msc_init;
#else
static void init(void) { init_io(); }
#endif