#include<iostream>
#include<time.h>

using namespace std;

void main()
{
	//A 20 0
	//B 20 1
	//C 20 2
	//D 20 3
	//F 20 4
	srand(time(NULL));
	int grades[20];
	for (int i = 0; i < 20; i++)
	{
		int category = rand() % 5;
		switch (category)
		{
			case 0:
				grades[i] = 90 + (rand() % 11);
				break;
			case 1:
				grades[i] = 80 + (rand() % 10);
				break;
			case 2:
				grades[i] = 70 + (rand() % 10);
				break;
			case 3:
				grades[i] = 60 + (rand() % 10);
				break;
			case 4:
				grades[i] = 0 + (rand() % 60);
				break;
		}
	}
	for (int i = 0; i < 20; i++)
	{
		cout << grades[i] << endl;
	}
}