#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 = 2; i < sizeP; ++i)
	//{
	//	j = f[i - 1];
	//	while (j != -1 && a[i - 1] != a[j])
	//	{
	//		j = f[j];
	//	}
	//	f[i] = j + 1;
	//}

	//same thing
	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

	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)	break;//max occurences found
	//			j = f[j];
	//		}
	//		else i++,j++;
	//	}
	//	else//use the bad suffix to find good prefix
	//		if (j == 0)	i++;//no good prefix can exist, moving to the next char in string
	//		else	j = f[j];//trying to find good prefix for bad suffix
	//}
	for (; i < sizeS; ++i)
	{
		while (j>0 && a[j] != b[i]) j = f[j];
		if (a[j] == b[i])
		{
			j++;
			if (j == sizeP)
			{
				occ[nOcc++] = i - j + 1;
				if (nOcc == 1000) break;
				j = f[j],--i;
			}
		}
	}

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