#include <stdio.h>
#include <stdlib.h>
#include <math.h>

// print array of size n
void print_array(int a[], int n) {
    int i = 0;
    while(i < n - 1 && a[i] == 0)i++;
    while(i < n) {
        printf("%d",a[i]);
        i++;
    }
    printf("\n");
}

// scans a single integer into array with size n
void scan_array(int a[], int n) {
    int i;
    for( i = 0; i < n; i++) {
        scanf("%1d", &a[i]);
    }
}

// the multiplication operation
// it is better to split the logic on several other functions
// then make multiply function call them.
int Calculate(int a[],int b[],int i,int n,int j,int Remainder,int m){

    int  Multi,Unit;
    int K[n][n+m];
    int U,P;
    static int Count=0,W=0;
    //Make K ==0;
    if ((i==n-1)&&(j==m-1)){
    for (P=0;P<n;P++){
        for(U=0;U<n+m;U++)
            K[P][U]=0;
    }
    }
    Multi =(a[i]*b[j])+Remainder;
    Unit = Multi%10;
    K[W][Count]=Unit;
    Count++;

    if (i==0){
        K[W][Count]=(((a[i]*b[j])+Remainder)/10)%10;
        Count=0;
        W++;
        for (P=0;P<W;P++)
            Count++;
        if ((j!=0)&&(i!=0))
            return 0;
    }
    if ((j==0)&&(i==0)){
        int Multiplication[n+m];
        for (P=0;P<n+m;P++){
            Multiplication[P]=0;
        }
        int A,S,Sum=0;
        int Q,V=0;
        for (P=0;P<m+n-1;P++){
            Sum=0;
            for (U=0;U<n-1;U++){
                Sum+=K[U][P];
                //Rema
            }
            if (!P)
                Remainder=0;
            Multiplication[V]=Remainder+Sum%10;
            Remainder = Sum/10;
            V++;
        }
            for (P=V;P>=0;P--)
                printf("%d",Multiplication[P]);
    }

    return 0;
}
void multiply(int a[], int n, int b[], int m, int r[], int t) {
    r[t]=0;
    int i,j;
    for (j=m-1;j>=0;j--){
        int Remainder=0;
        for (i=n-1;i>=0;i--){
            if(i==n-1)
                Remainder=0;
            else Remainder=(a[i+1]*b[j])/10;
            Calculate(a,b,i,n,j,Remainder,m);
        }
    }
}

// don't change any thing in the main
int main() {

    int n;
    scanf("%d", &n);
    int x[n];
    scan_array(x, n);

    int m;
    scanf("%d", &m);
    int y[m];
    scan_array(y, m);
    //Multiply
    int t = n + m;
    int ans[t];

    multiply(x, n, y, m, ans, t);
    //print_array(ans, t);

    return 0;
}