解法一：模拟

#include <bits/stdc++.h>
using namespace std;
class Student {
public:
    string name;
    char gender;
    string id;
    int grade;
};
vector<Student> students;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N;
    cin >> N;
    int maleIndex = -1;
    int femaleIndex = -1;
    for (int i = 0; i < N; ++i) {
        Student student;
        cin >> student.name >> student.gender >> student.id >> student.grade;
        students.emplace_back(student);
        if (student.gender == 'M' && (maleIndex == -1 || student.grade < students[maleIndex].grade)) {
            maleIndex = i;
        }
        if (student.gender == 'F' && (femaleIndex == -1 || student.grade > students[femaleIndex].grade)) {
            femaleIndex = i;
        }
    }
    Student male, female;
    if (femaleIndex != -1) {
        female = students[femaleIndex];
        cout << female.name << " " << female.id << '\n';
    } else {
        cout << "Absent\n";
    }
    if (maleIndex != -1) {
        male = students[maleIndex];
        cout << male.name << " " << male.id << '\n';
    } else {
        cout << "Absent\n";
    }
    if (maleIndex != -1 && femaleIndex != -1) {
        cout << female.grade - male.grade << '\n';
    } else {
        cout << "NA\n";
    }
}