#include <stdio.h>
#include <string.h>
#include <iostream>
using namespace std;

char a[2000005], b[2000005];
int occ[1005], f[2000005], nOcc = 0, i, j, sizeP, sizeS;

void buildF()
{
	f[0] = -1;
	f[1] = 0;
	//for (i = 1; i < sizeP; ++i)
	//{
	//	j = f[i - 1];
	//	while (j != -1 && a[i - 1] != a[j])
	//	{
	//		j = f[j];
	//	}
	//	f[i] = j + 1;
	//}
	i = 2;
	j = 0;
	while (i < sizeP)
	{
		if (a[i - 1] == a[j])
		{
			f[i++] = ++j;
		}
		else if (j>0)
		{
			j = f[j];
		}
		else
		{
			f[i++] = j = 0;
		}
	}
}

int main()
{
	//freopen("strmatch.in", "r", stdin);
	//freopen("strmatch.out", "w", stdout);

	memset(a, 0, 2000005);
	memset(b, 0, 2000005);

	scanf("%s%s", a, b);

	sizeP = strlen(a);
	sizeS = strlen(b);

	buildF();//build the bad suffix good prefix function

	//for (i = 0; i < sizeP;++i)
	//cout << f[i] << endl;

	i = j = 0;
	while (i < sizeS)
	{
		if (b[i] == a[j])//the characters match
		{
			if (j == sizeP - 1)//found an occurence
			{
				occ[nOcc++] = i-j;

				if (nOcc == 1000)//max occurences found
				{
					break;
				}

				j = f[j];
			}
			else
			{
				i++;
				j++;
			}
		}
		else//use the bad suffix to find good prefix
		{
			if (j == 0)//no good prefix can exist, moving to the next char in string
			{
				i++;
			}
			else
			{
				j = f[j];
			}
		}
	}

	printf("%d\n", nOcc);
	for (i = 0; i < nOcc; ++i)
	{
		printf("%d ", occ[i]);
	}
}