#include<cstdio>
#include<cstring>
int n,m,i,q1,q2,p1,p2,nr1,nr2,nra1,nra2,q,nr,o[2000002];
char a[2000002],b[2000002];
int main()
{
    freopen("strmatch.in","r",stdin);
    freopen("strmatch.out","w",stdout);
    scanf("%s",&a);
    scanf("%s",&b);
    n=strlen(a);
    m=strlen(b);
    p1=666013;
    p2=686969;
    q=73;
    q1=q2=1;
    nr1=nr2=0;
    for(i=0;i<n;i++)
    {
        nra1=(nra1*q+a[i])%p1;
        nra2=(nra2*q+a[i])%p2;
        if(i>0)
        {
            q1=(q1*q)%p1,
            q2=(q2*q)%p2;
        }
    }

    if(n>m)
    {
        printf("0\n");
    }
    else
    {
        for(i=0;i<n;i++)
        {
            nr1=(nr1*q+b[i])%p1;
            nr2=(nr2*q+b[i])%p2;
        }
        if(nr1==nra1&&nr2==nra2)
        {
            o[0]=1;
            nr++;
        }
        for(i=n;i<m;i++)
        {
            nr1=((nr1-(b[i-n]*q1)%p1+p1)*q+b[i])%p1;
            nr2=((nr2-(b[i-n]*q2)%p2+p2)*q+b[i])%p2;
            if(nr1==nra1&&nr2==nra2)
            {
                o[i-n+1]=1;
                nr++;
            }
        }
        printf("%d\n",nr);
        nr=0;
        for(i=0;i<m&&nr<1000;i++)
            if (o[i]!=0)
            {
                nr++;
                printf("%d ", i);
            }
        printf("\n");
    }
    return 0;
}