#include <iostream>
using namespace std;

int main() {
    // Prompt the user to enter their name
    cout << "Please enter your name: ";
    string name;
    cin >> name;

    // Prompt the user to enter their math, Chinese, and English marks
    float mathMark, chineseMark, englishMark;
    cout << "Please enter your math mark: ";
    cin >> mathMark;
    cout << "Please enter your Chinese mark: ";
    cin >> chineseMark;
    cout << "Please enter your English mark: ";
    cin >> englishMark;

    // Calculate the average mark
    float averageMark = (mathMark + chineseMark + englishMark) / 3;

    // Determine the grade based on the average mark
    char grade;
    if (averageMark >= 90) {
        grade = 'A';
    } else if (averageMark >= 80) {
        grade = 'B';
    } else if (averageMark >= 70) {
        grade = 'C';
    } else if (averageMark >= 60) {
        grade = 'D';
    } else {
        grade = 'F';
    }

    // Print the results
    cout << endl << "Name: " << name;
    cout << endl << "Math Mark: " << mathMark;
    cout << endl << "Chinese Mark: " << chineseMark;
    cout << endl << "English Mark: " << englishMark;
    cout << endl << "Average Mark: " << averageMark;
    cout << endl << "Grade: " << grade << endl;

    return 0;
}