// editor4
#include<iostream>
using namespace std;
class detail
{
    public:
    string name;
    float salary;
    void data()
    {
    
        cin>>salary<<name;
    }
};
class verifyed:public detail
{
    public:
    void value()
    {
        if(salary<0)
        {
            cout<<"Invalid input";
            return;
        }
        cout<<name<<salary;
    }
};
int main()
{
    verifyed V;
    V.data();
    V.value();
}