10093(숫자)

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <math.h>
//숫자 10093
using namespace std;
int main(){
	ios::sync_with_stdio(0); 
	cin.tie(0);
	
	long long int a, b;
	cin >> a >> b;
	if (a>b)
	{
		long long int temp;
		temp = a;
		a = b;
		b = temp;
	}
	if (a==b)
	{
		cout << "0" << '\n';
	}
	else
	{
		cout << b - a - 1 << '\n';

	}
	for (long long int i = a+1; i < b; i++)
	{
		cout << i << ' ';
	}
}