#include <termios.h>
#include <stdio.h>
#include <unistd.h>

using namespace std;

char getch(void){
	struct termios oldt, newt;
	char ch;

	tcgetattr(STDIN_FILENO, &oldt);
	newt = oldt;
	newt.c_lflag &= ~(ICANON | ECHO);
	tcsetattr(STDIN_FILENO, TCSANOW, &newt);
	ch = getchar();
	tcsetattr(STDIN_FILENO, TCSANOW, &oldt);

	return ch;
};