# include<algorithm>
# include<cstdio>
# include<cstring>
using namespace std;
const int NMAX=100;

void printh(int x[])
{
	for(int i=x[0];i>=1;--i)
		printf("%d", x[i]);
printf("\n");
}
void adunh(int a[], int b[], int c[])
{
	int tr,i,aux;
	c[0]=max(a[0],b[0]);
	tr=0;
	for(i=1;i<=c[0];i++)
	{
		aux=a[i]+b[i]+tr;
		c[i]=aux%10;
		tr=aux/10;
	}
	if(tr)
		c[++c[0]]=tr;
}
void scadh(int a[],int b[], int c[])
{
	int i, impr, aux;
	impr=0;
	c[0]=a[0];
	for( i=1;i<=c[0];i++)
	{
		aux=a[i]-b[i]-impr;
		if(aux<0)
		{
			aux=aux+10;
			c[i]=aux%10;
			impr=1;
		}
		else
		{
			c[i]=aux;
			impr=0;
		}
	}
	while(c[0]>1 && c[c[0]]==0)
		c[0]--;
}
int cmph(int a[], int b[])
{
	/* return 0 daca a=b;
			  1 daca a>b;
			  -1 daca a<b; */
if(a[0]>b[0]) return 1;
if(b[0]>a[0]) return -1;
for (int i=a[0];i>=1;i--)
	if(a[i]>b[i] ) return 1;
	else if(a[i]<b[i]) return -1;
return 0;
}
void prodhi (int a[], int k, int c[])
{
	int i,tr,aux;
	c[0]=a[0];
	for(i=1;i<=c[0];i++)
		c[i]=a[i]*k;
	tr=0;
	for(i=1;i<=c[0];i++)
	{
		aux=c[i]+tr;
		c[i]=aux%10;
		tr=aux/10;
	}
	while(tr)
	{
		c[++c[0]]=tr%10;
		tr=tr/10;
	}

}
void prodh(int a[], int b[], int c[])
{
    memset(c,0,sizeof(c));
    int i,j,tr,aux;
    c[0]=a[0]+b[0]-1;
    for(i=1;i<=a[0];i++)
    for(j=1;j<=b[0];j++)
        c[i+j-1]+=a[i]*b[j];
        tr=0;
        for(i=1;i<=c[0];i++)
        {
            aux=c[i]+tr;
            c[i]=aux%10;
            tr=aux/10;
        }
    if(tr) c[++c[0]]=tr;
}
int rest(int a[], int k)
{
    int r=0;
    for(int i=a[0];i>=1;i--)
    {
        r=(10*r+a[i])%k;
    }
    return r;
}
int main()
{
	freopen("next.in","r",stdin);
freopen("next.out","w",stdout);
	int a[NMAX], b[NMAX], c[NMAX], d;
	memset(a,0,sizeof(a));
	memset(b,0,sizeof(b));
	memset(c,0,sizeof(c));
	char sir[100];
	gets(sir);
	int n,i;
	n=strlen(sir);
	for(i=n-1;i>=0;i--)
		a[n-i]=sir[i]-'0';
    a[0]=n;
	scanf("%d", & d);
int x,k;
x=d-rest(a,d);
k=0;
while(x!=0)
{
    k++;
    b[k]=x%10;
    x/=10;
}
b[0]=k;
for(i=1;i<=k/2+1;i++)
    switch(b[i],b[n+1-i]);
adunh(a,b,c);
printh(c);

      return 0;
}