import java.io.*;
import java.util.*;

public class Main
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		int[] x;
		x = new int[100000];
		int i=0,j;
		while(true)
		{
			x[i] = sc.nextInt();
			if(x[i]==0)break;
			i++;
		}
		for(j=0;j<i;j++)
		{
			System.out.printf("Case %d: %d\n",j+1,x[j]);
		}
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz