#include<iostream>
#include<string>
using namespace std;
class student{
    private:
    string name;
    string subject;
    int marks;
    public:
    student(string n, string s, int m){
        name = n;
        subject = s;
        marks = m;
    }
    void displayGrade(){
        if(name.empty() || subject.empty() || marks > 100){
            cout <<"invalid input";
            return;
        }
        cout<<"Name:" << name < endl;
        cout<<"Subject:" << subject 
    }
}