#include <cstdio>
#include <cstring>

using namespace std;

char sub[2000001],str[2000001];
int pattern[2000001],n,m,rez[2000001];
int counter=0;
void makePattern()
{
    for(int i=1,j=0;i<n;i++)
    {
        while(sub[i]!=sub[j] && j>0)
            j=pattern[j-1];
        if(sub[i]==sub[j])
            pattern[i]=++j;
    }
}

void searchPattern()
{
    for(int i=0,j=0;i<m;i++)
    {
        while(str[i]!=sub[j] && j>0)
            j=pattern[j-1];
        if(str[i]==sub[j])
        {
            if(j==n-1)
            {
                rez[counter++]=i-n+1;
                j=pattern[j];
            }
            else
                j++;
        }
        if(counter==1000)
            return;
    }
}
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    scanf("%s\n%s",&sub,&str);
    n=strlen(sub);
    m=strlen(str);
    makePattern();
    searchPattern();
    printf("%d\n",counter);
    for(int i=0;i<counter;i++)
        printf("%d ",rez[i]);
    return 0;
}