main()
{int x,a,b,c,d,i;
a=b=c=d=0;
for(i=1;i<=20;i++)
{scanf("%d",&x);
switch(x/10)
{case 10:
case 9:
case 8:a++;
case 7:b++;
case 6:c++;
default:d++;}
}
printf("0-59: %d\n",d);
printf("60-69: %d\n",c);
printf("70-79: %d\n",b);
printf("80-100: %d\n",a);}