#include <stdio.h>
  main() {
    int y;
    y = 2100;
    if ( y%4 != 0) {
		printf("a common year \n");
	} else if ( y%100 != 0) {
		printf("a leap year \n");
	} else if ( y%400 != 0) {
		printf("a common year \n");
	} else {
		printf("a leap year \n");
	}
	return 0;
}