import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		
		int i=0;
		
		Scanner sc = new Scanner(System.in);
		
		
		while(true){
		    int x = sc.nextInt();
		    if ( x == 0 ) break;  
		
	         i++;
	    	 System.out.println("Case" + " " +i+ "" +":"+" " + x );
	     }

	     }
		
	}

/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