/********************************************************************
@file     Main.cpp
@date     2017-5-8
@author   Zoro_Tiger
@brief    问题 1008: C语言程序设计教程（第三版）课后习题5.6
          http://www.dotcpp.com/oj/problem1008.html
********************************************************************/
#include <cstdio>

#define TEST
#undef  TEST

//!获取成绩等级
char GetGrade(int number_score);

int main(int argc, const char* argv[])
{

#ifdef TEST
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif

    int number_score = 0;
    while (scanf("%d", &number_score) != EOF)
    {
        printf("%c\n", GetGrade(number_score));
    }

    return 0;
}

char GetGrade(int number_score)
{
    if (number_score >= 90)
    {
        return ‘A‘;
    }
    else if (number_score >= 80)
    {
        return ‘B‘;
    }
    else if (number_score >= 70)
    {
        return ‘C‘;
    }
    else if (number_score >= 60)
    {
        return ‘D‘;
    }
    else
    {
        return ‘E‘;
    }
}