#include <iostream>
using namespace std;
char c[101];
int n,i,a[101],x;
int main()
{
cin>>c;
n=0;
while(c[n]>='0' && c[n]<='9')
{
a[n]=c[n]-'0';
n++;
}
n--;
if((n+1)%2==1){cout<<1;for(i=1;i<n;i=i+2){x=a[i]*2+a[i+1];cout<<x;};}
else for(i=0;i<n;i=i+2)cout<<a[i]*2+a[i+1];
return 0;
}