#include <cstdio>
#include <cstring>
#include <vector>
#define Nmax 2000005
#define P1 100007
#define P2 100021
#define X 123456
#define Y 654321

using namespace std;

char a[Nmax],b[Nmax];
int sol[Nmax];

int main()
{
    int N,M,v1=0,v2=0,v3=0,v4=0,aux1=1,aux2=1,i;
    freopen ("strmatch.in","r",stdin);
    freopen ("strmatch.out","w",stdout);
    scanf("%s%s", (a+1),(b+1));
    N=strlen(a+1); M=strlen(b+1);
    for(i=1;i<=N;++i)
    {
        v1=(1LL*v1*X+a[i]-'0')%P1;
        v2=(1LL*v2*Y+a[i]-'0')%P2;
    }
    for(i=1;i<=N;++i)
    {
        v3=(1LL*v3*X+b[i]-'0')%P1;
        v4=(1LL*v4*Y+b[i]-'0')%P2;
    }
    for(i=1;i<N;++i)
    {
        aux1=(1LL*aux1*X)%P1;
        aux2=(1LL*aux2*Y)%P2;
    }
    if(v3==v1 && v4==v2)
        sol[++sol[0]]=0;
    for(i=N+1;i<=M;++i)
    {
        v3=(((v3-(1LL*(b[i-N]-'0')*aux1)%P1+P1)%P1)*X+b[i]-'0')%P1;
        v4=(((v4-(1LL*(b[i-N]-'0')*aux2)%P2+P2)%P2)*Y+b[i]-'0')%P2;
        if(v3==v1 && v4==v2)
            sol[++sol[0]]=i-N;
    }
    printf("%d\n", sol[0]);
    for(i=1;i<=sol[0] && i<=1000;++i)
        printf("%d ", sol[i]);
    printf("\n");
    return 0;
}