Răspuns:
#include <iostream>
using namespace std;
int a,b,aux,s;
int main()
{
cin>>aux;
while(aux)
{
if(aux%10==2 || aux%10==3 || aux%10==5 || aux%10==7)
s=s+aux%10;
aux=aux/10;
}
cin>>aux;
while(aux)
{
if(aux%10==2 || aux%10==3 || aux%10==5 || aux%10==7)
s=s+aux%10;
aux=aux/10;
}
cout<<s;
return 0;
}
Explicație: