#include <termios.h>

struct termios ot, nt;

V it() {
  tcgetattr(STDIN_FILENO, &ot);
  nt = ot;
  nt.c_lflag &=(~ICANON & ~ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &nt);
}
V rt() { tcsetattr(STDIN_FILENO, TCSANOW, &ot); }