#include <iostream>

void Print1(int a, int b)
{
    while(a < b)
        std::cout << a++ << ' ';
    while(a > b)
        std::cout << a-- << ' ';
    std::cout << a << std::endl;
}
void Print2(int a, int b)
{
	int incr = 1 - 2 * ((b - a) < 0);
	while(a != b)
	{
        std::cout << a << ' ';
        a += incr;
	}
    std::cout << a << std::endl;
}

int main() 
{
	int a, b;
	std::cin >> a >> b;
	Print1(a, b);
	Print2(a, b);
	return 0;
}