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#include<stdio.h>
#include<string.h>
char s[1000000],e[1000000];
int x[20],u[20],n,i,k,j,t,l,r;
long long d,m;
int main() {
freopen("next.in","r",stdin),freopen("next.out","w",stdout),gets(s),scanf("%lld",&d),n=strlen(s);
for(i=0;i<n;i++)
m=(m*10+(s[i]-'0'))%d;
for(;m;m/=10)
x[++k]=m%10;
for(i=1;i<=k;i++)
u[i]=x[k-i+1];
for(i=n-1,j=k,t=l=0;i>=0&&j;i--,j--,t/=10)
e[++l]=((t+=(s[i]-'0')+u[j])%10)+'0';
for(r=i;r>=0;r--,t/=10)
e[++l]=((t+=(s[r]-'0'))%10)+'0';
for(r=j;r;r--,t/=10)
e[++l]=((t+=u[r])%10)+'0';
if(t)
e[++l]=t+'0';
for(i=l;i;i--)
printf("%c",e[i]);
}