#include <fstream>
using namespace std;
ifstream fin ("adunare.in");
offstream fout ("adunare.out");
int a,b,x,y,k,r,A[20000000000],B[20000000000];
int main()
{
    fin>>a>>b;
    x=a;
    y=b;
    while (a!=0)
    {
    	k++;
    	a=a/10;
	}
	A[0]=k;
	while (b!=0)
	{
		r++;
		b=b/10;
	}
	B[0]=r;
	for (i=1;i<=A[0]||i<=B[0]||t!=0;i++)
	{
	 C[i]=(t+A[i]+B[i])%10;
	 t=(t+A[i]+B[i])/10;	
	}
	cout<<C[i];
    return 0;
}