import java.util.Scanner;

public class Main {

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

		int i=0;
		int data[]=new int[10000];
		while(true){
			int x=sc.nextInt();

			if(x==0)	break;
			else{
				data[i]=x;
				i++;
			}
		}

		for(int j=0;j<i;j++)	System.out.println("Case "+(j+1)+": "+data[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