//minamoto

 #include<iostream>

 #include<cstdio>

 #include<cmath>

 using namespace std;

 char sr[<<],z[];int C=-,Z;

 inline void Ot(){fwrite(sr,,C+,stdout),C=-;}

 inline void print(int x){

     if(C><<)Ot();if(x<)sr[++C]=,x=-x;

     while(z[++Z]=x%+,x/=);

     while(sr[++C]=z[Z],--Z);

 }

 const int N=2e5+;const double Pi=acos(-1.0);

 int r[N],l=,limit=,c[N],n;char sa[N],sb[N];

 struct complex{

     double x,y;

     complex(double xx=,double yy=){x=xx,y=yy;}

     inline complex operator +(complex b){return complex(x+b.x,y+b.y);}

     inline complex operator -(complex b){return complex(x-b.x,y-b.y);}

     inline complex operator *(complex b){return complex(x*b.x-y*b.y,x*b.y+y*b.x);}

 }a[N],b[N];

 void FFT(complex *a,int type){

     for(int i=;i<limit;++i)

     if(i<r[i]) swap(a[i],a[r[i]]);

     for(int mid=;mid<limit;mid<<=){

         complex Wn(cos(Pi/mid),type*sin(Pi/mid));

         for(int R=mid<<,j=;j<limit;j+=R){

             complex w(,);

             for(int k=;k<mid;++k,w=w*Wn){

                 complex x=a[j+k],y=w*a[j+k+mid];

                 a[j+k]=x+y,a[j+k+mid]=x-y;

             }

         }

     }

 }

 int main(){

 //    freopen("testdata.in","r",stdin);

     scanf("%d",&n),--n;

     scanf("%s%s",sa,sb);

     for(int i=;i<=n;++i) a[i].x=sa[n-i]-'',b[i].x=sb[n-i]-'';

     while(limit<=n*) limit<<=,++l;

     for(int i=;i<=limit;++i) r[i]=(r[i>>]>>)|((i&)<<(l-));

     FFT(a,),FFT(b,);

     for(int i=;i<=limit;++i) a[i]=a[i]*b[i];

     FFT(a,-);

     for(int i=;i<=limit;++i) c[i]=(int)(a[i].x/limit+0.5);

     for(int i=;i<=limit;++i)

     if(c[i]>){

         c[i+]+=c[i]/,c[i]%=;

         if(i+>limit) ++limit;

     }

     for(int i=limit;i>=;--i)

     if(c[i]==) --limit;

     else break;

     for(int i=limit;i>=;--i) print(c[i]);

     Ot();

     return ;

 }