#include <stdio.h>
int main () {
	char c;
	int broj_nula = 0;
	while ((c=getchar())!=EOF) {
		if (c!='0' && c!='1' && c!='\n') {
			printf("Greska:%c.\n",c);
			return -1;
		}
		if (c=='0')
			broj_nula++;
	}
	if (broj_nula%2==0)
		printf("PARAN.\n");
	else
		printf("NEPARAN.\n");
	return 0;

}