#include <iostream>
using namespace std;
int main() {
int n,sum=0,cn,uc;
cin>>n;
cn=n;
uc=cn%10;
while(cn!=0)
{
if(uc%2!=0)
sum=sum+uc;
cn=cn/10;
}
cout<<"sum= "<<sum;
return 0;
}
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