#include <iostream>
#include <cstdlib>
#include <cmath>

using namespace std;
int main()
{
	int size1,size2; 
	cin>>size1>>size2; //diavazoume ta megethi pinakwn//
	int ar1[size1],ar2[size2];
	for (int i=0;i<size1;i++) cin>>ar1[i]; //diavazoume tous arithmous opws tha ginontan automata sto programma tou zhthmatos 2//
	for (int i=0;i<size2;i++) cin>>ar2[i]; //diavazoume tous arithmous opws tha ginontan automata sto programma tou zhthmatos 2//
	
	if (size1<=size2) //lynw to problhma se periptwsh pou size1<=size2//
	{
		int sum[size2];
	    for (int i=0;i<size2;i++)
	    {
		    sum[i]=ar2[i];
      	}
      	for (int i=0;i<size1;i++)
	    {
		    sum[i+size2-size1]=sum[i+size2-size1]+ar1[i];
      	}
      	for (int i=size2-1;i>=1;i--)
	    {
		      if (sum[i]>=10)  //opou yparxei kratoumeno//
		      {
			        sum[i]=sum[i]-10;
			        sum[i-1]++;
	       	  }
	    }
	    
	    if (sum[0]>=10) //apotelesmata//
		{
			cout<<"yperxilish akeraiou"<<endl;
		}else
		{
			for (int i=0;i<8;i++) cout<<sum[i];
		}
	}
	
	
	
	
	
	if (size2<size1) //lynw to problhma se periptwsh pou size2<size1//
	{
		int sum[size1];
	    for (int i=0;i<size1;i++)
	    {
		    sum[i]=ar1[i];
      	}
      	for (int i=0;i<size2;i++)
	    {
		    sum[i+size1-size2]=sum[i+size1-size2]+ar2[i];
      	}
        for (int i=size1-1;i>=1;i--)
	    {
		      if ( sum[i]>=10)  //opou yparxei kratoumeno//
		      {
			        sum[i]=sum[i]-10;
			        sum[i-1]++;
	       	  }
	    }
	    
		if (sum[0]>=10) //apotelesmata//
		{
	    	cout<<"yperxilish akeraiou"<<endl;
	    }else 
		{
	    	for (int i=0;i<8;i++) cout<<sum[i];
	    }
	    
	}
	

	
	
	
	system ("PAUSE");
	return 0;
}