struct SAM{
    int now,tot,rt,last,son[500010][26],fa[500010],mx[500010],l1[500010],l2[500010],siz[500010];
    void init(){
        memset(son,0,sizeof(son));
        tot=rt=last=1;
        mx[1]=0;
    }
    void extend(int ch){
        int p=last,np=++tot;
        mx[np]=mx[p]+1;
        for(;p&&!son[p][ch];p=fa[p])son[p][ch]=np;
        if(!p)fa[np]=rt;
        else{
            int q=son[p][ch];
            if(mx[q]==mx[p]+1)fa[np]=q;
            else{
                int nq=++tot;
                mx[nq]=mx[p]+1;
                memcpy(son[nq],son[q],sizeof(son[q]));
                fa[nq]=fa[q];
                fa[q]=fa[np]=nq;
                for(;son[p][ch]==q;p=fa[p])son[p][ch]=nq;
            }
        }
        last=np;
        siz[np]=1;
    }
}sam;