#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("strmatch.in");
ofstream g("strmatch.out");
char a[2000002];char b[2000002];
int ans[1001],K=0;
int n,m;unsigned int q[2000002];
void INIQ()
{
    q[1]=0;int j=0;
    for(int i=2;i<=n;++i)
    {
        while(a[j+1]!=a[i]&&j>0)j=q[j];
        if(a[j+1]==a[i])++j;
        q[i]=j;
    }
}
int main()
{
    a[0]=b[0]=' ';
    f>>(a+1)>>(b+1);
    n=strlen(a);--n;
    m=strlen(b);--m;
    INIQ();
    for(int i=1,j=0;i<=m;++i)
    {
        while(a[j+1]!=b[i]&&j>0)j=q[j];
        if(a[j+1]==b[i]){++j;if(j==n){j=q[j];++K;if(K<=1000)ans[K]=i-n;}}
    }
    g<<K<<'\n';
    for(int i=1;i<=K;++i){g<<ans[i]<<' ';}
}