#include <iostream>
#include <string>
using namespace std;
#define INT_LENGTH 32767
int main()
{
string str;
int a[INT_LENGTH]={0};
int maxLength=0;
while(cin>>str && str!="0"){
int len=str.length();
maxLength = (maxLength>len)? maxLength : len ;
for(int i=0;i<len;i++){
a[len-i-1] += str[i] - \'0\';
}
for(int i=0;i<maxLength;i++){
if(a[i]/10==1){
a[i+1]++;
a[i]-=10;
}
}
if(a[maxLength]!=0){
maxLength++;
}
}
for(int i= maxLength -1;i>=0;i--){
cout<<a[i];
/*if(a[i]>0){
for(int j=i;j>=0;j--){
cout<<a[j];
}
break;
}*/
}
cout<<endl;
//system("pause");
return 0;
}