#include<iostream>
using namespace std;
int main()
{
	char a[1000],b[1000],t;
	int i,j,x,lena,lenb;
	cin>>a;
	if(a[0]=='0' && a[1]==0)
	{
		cout<<"0"<<endl;
		return 0;
	}
	lena=strlen(a);
	for(;a[0]=='0';)
	{
		for(i=0;i<lena;i++)
		{
			a[i]=a[i+1];
		}
		lena--;
		if(a[0]=='0' && a[1]==0)
			break;
	}
	for(j=0;j<(lena/2);)
	{
		if(j<(lena/2))
		{
			t=a[j];
			a[j]=a[lena-1-j];
			a[lena-1-j]=t;
			j++;
		}
	}
	while (cin>>b)
	{
		if(b[0]=='0' && b[1]==0)
			break;
		lena=strlen(a);
		lenb=strlen(b);
		for(;b[0]=='0';)
		{
			for(i=0;i<lenb;i++)
			{
				b[i]=b[i+1];
			}
			lenb--;
			if(b[0]=='0' && b[1]==0)
				break;
		}
		for(j=0;j<(lenb/2);)
		{
			if(j<(lenb/2))
			{
				t=b[j];
				b[j]=b[lenb-1-j];
				b[lenb-1-j]=t;
				j++;
			}
		}
		if(lena<lenb)
		{
			for(i=0,j=0;j<lenb;i++,j++)
			{
				if(i<lena && j<lenb)
					x=a[i],a[i]=b[i],b[i]=x;
				if(i>=lena && j<lenb)
					a[j]=b[j];
			}
			a[lenb]=0,b[lena]=0;
			x=lena,lena=lenb,lenb=x;
		}
		for(i=0;i<lenb;i++)
		{
			x=a[i]+b[i]-'0'-'0';
			a[i]=(x%10)+'0';
			if((x/10)==1)
			{
				if(a[i+1]>='0' && a[i+1]<'9')
				{
					a[i+1]++;
					continue;
				}
				for(j=i;a[j+1]=='9';j++)
				{
					a[j+1]='0';
					if(a[j+2]<'9' && a[j+2]>='0')
						a[j+2]++;
					if(a[j+2]==0)
						a[j+2]='1',a[j+3]=0;
				}
				if(a[i+1]==0)
					a[i+1]='1',a[i+2]=0;
			}
		}
	}
	lena=strlen(a)-1;
	for(i=0;i<lena;i++,lena--)
	{
		t=a[i];
		a[i]=a[lena];
		a[lena]=t;
	}
	cout<<a<<endl;
	return 0;
}