#include<cstdio>
#include<cstring>
#define n1 2000003
#define n2 2000017
char v[2000001],v2[2000001],sol[1001];
int main ()
{freopen ("strmatch.in","r",stdin);
freopen ("strmatch.out","w",stdout);
int k1,k2,i,m1,m2,p1,p2,x1,x2,q=0;
scanf("%s%s",&v,&v2);
k1=strlen(v);
k2=strlen(v2);
x1=x2=1;
m1=0;
m2=0;
for(i=k1-1;i>=0;i--)
    {m1=(m1+v[i]*x1)%n1;
    m2=(m2+v[i]*x2)%n2;
    x1=(x1*123)%n1;
    x2=(x2*123)%n2;
    }
x1=x2=1;
p1=0;
p2=0;
for(i=k1-1;i>=0;i--)
    {p1=(p1+v2[i]*x1)%n1;
    p2=(p2+v2[i]*x2)%n2;
    x1=(x1*123)%n1;
    x2=(x2*123)%n2;
    }
x1=(x1/123)%n1;
x2=(x2/123)%n2;
if(m1==p1&&m2==p2)
    {q=1;
    sol[1]=0;
    }
for(i=1;i<k2-k1+1;i++)
    {p1=(p1-v2[i-1]*x1+n1)%n1;
    p2=(p2-v2[i-1]*x2+n2)%n2;
    p1=(p1*123)%n1;
    p2=(p2*123)%n2;
    p1=(p1+v2[i+k1-1])%n1;
    p2=(p2+v2[i+k1-1])%n2;
    if(m1==p1&&m2==p2)
        {q++;
        if(q<=1000)
            sol[q]=i;
        }
    }
printf("%d\n",q);
for(i=1;i<=q;i++)
    printf("%d ",sol[i]);
return 0;
}