#include#include#includeusingnamespacestd;classCFirstLevel{public:CFirstLevel(conststring&_name):name(_name){}//...protected:stringname;};templateclassCSecondLevel:publicCFirstLevel{public:CSecondLevel(conststring&_name):CFirstLevel(_name){}virtualvoidPushBack(T)=0;virtualvoidPrint(intI){coutdat