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

class Main
{
    public static void main(String[] args)
    {
	Scanner sc = new Scanner(System.in);

	int n = sc.nextInt();
	int i = 1;
	while (n != 0) {
	    System.out.println("Case " + i++ + ": " + n);
	    n = sc.nextInt();
	}
    }
}
/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