#include <fstream>
#include <cstring>

using namespace std;

ifstream fin ("produs.in");
ofstream fout ("produs.out");

char c[1010],d[1010];
short int i,a[1010],b,k,t;

int main()
{
    fin >> c+1;
    fin >> b;

    a[0]=strlen(c+1);
    i=a[0];
    while (i>=1)
    {
        a[++k]=c[i]-'0';
        i--;
    }







    i=1;
    while (i<=a[0]  || t)
    {
        a[i]=(t+=a[i]*b)%10;
        i++;
        t/=10;
    }
    a[0]=i-1;
    fout << a+b;

    return 0;
}