Quiz on Enumeration

What will be the output of the following program:

# include <stdio.h> 
int main( )
{
enum grade { Agrade, Bgrade, Cgrade } ;
enum grade  stud1, stud2, stud3 ;
stud1 = Agrade ;
stud2 = Bgrade ;
stud3 = Cgrade;
printf ( "%d %d %d\n", stud1, stud2, stud3 ) ;
return 0 ;
}