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#include <bits/stdc++.h>
using namespace std;
ifstream fin("strmatch.in");
ofstream fout("strmatch.out");
int n,m,l,i,cnt,sol[1010],p[1010];
char a[2000010],b[2000010];
int main() {
fin>>a+1>>b+1;
n=strlen(a+1);
m=strlen(b+1);
for(i=2;i<=n;i++){
while(l && a[l+1]!=a[i])
l=p[l];
if(a[i]==a[l+1])
l++;
p[i]=l;
}
for(i=1;i<=m;i++){
while(l && a[l+1]!=b[i])
l=p[l];
if(b[i]==a[l+1])
l++;
if(l==n){
if(++cnt<=1000)
sol[cnt]=i-l;
l=p[l];
}
}
fout<<cnt<<"\n";
for(i=1;i<=min(1000,cnt);i++)
fout<<sol[i]<<" ";
return 0;
}