int main()
{
    int n;
    double sz[N],fd[N]={0};
    scanf("%d",&n);
    int i;
	for(i=0;i<n;i++)
	{
		scanf("%lf",&sz[i]);
	}
	for(i=0;i<n;i++)
	{
		if(sz[i]<=18&&sz[i]>=1)
		{
			fd[0]++;
		}else if(sz[i]<=35&&sz[i]>=19)
		{
            fd[1]++;
		}else if(sz[i]<=60&&sz[i]>=36)
		{
			fd[2]++;
		}else if(sz[i]>=61)
		{
			fd[3]++;
		}
        
	}
	for(i=0;i<4;i++)
	{
		fd[i]=100*fd[i]/n;
	}
	printf("1-18: %.2lf%%\n",fd[0]);
	printf("19-35: %.2lf%%\n",fd[1]);
    printf("36-60: %.2lf%%\n",fd[2]);
	printf("60??: %.2lf%%\n",fd[3]);
	return 0;
}