#include <stdio.h>
    void main()
    {
        enum DegClass {Fail,Ordinary,Third,TwoTwo,TwoOne,First};
        int Mark;
        enum DegClass Grade;
        char MedCertificate;

        scanf("%d",&Mark);   /*  Must be in range 0..100 */
        if (Mark<45) Grade = Fail; else
        if (Mark<50) Grade = Ordinary; else
        if (Mark<55) Grade = Third; else
        if (Mark<65) Grade = TwoTwo; else
        if (Mark<80) Grade = TwoOne; else
                     Grade = First;

        if((MedCertificate=getchar())=='y'&&Grade<First) Grade++;

        switch (Grade)
        {
case Fail:        printf("Student failed\n"); break;
case Ordinary:    printf("Student obtained ordinary\n"); break;
case Third:       printf("Student obtained third\n"); break;
case TwoTwo:      printf("Student obtained two two\n"); break;
case TwoOne:      printf("Student obtained two one\n"); break;
case First:       printf("Student obtained first\n"); break;
        }
    }