成績轉換

#include<iostream>
using namespace std;
int main()
{
	int num;
	cin>>num;
	while(num--)
	{
		int score;
		cin>>score;
		switch(score/10)
		{
		case 10:
		case 9:cout<<'A';break;
		case 8:cout<<'B';break;
		case 7:cout<<'C';break;
		case 6:cout<<'D';break;
		default:cout<<'E';break;
		}
		cout<<endl;
	}
}