#include<stdio.h>
long int n,i,c,cont[2000],t,p;
int main()
{
	FILE *f=fopen("carnati.in","r"),*g=fopen("carnati.out","w");
	fscanf(f,"%ld%ld",&n,&c);
	for(i=1;i<=n;i++){fscanf(f,"%ld%ld",&t,&p);cont[t]++;}
	for(i=1;i<=1500;i++)if(cont[i]>7)for(;;);
	fprintf(g,"a\n");
	fcloseall();
	return 0;
}