import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) throws IOException {
				
		BufferedReader bis=new BufferedReader(new InputStreamReader(System.in));
		Scanner sc = new Scanner(bis);
		
		
	    int data;
	    for(int i =1;;i++){data=sc.nextInt();
	    
	      if(data!=0){
	    	System.out.println("Case "+i+": "+data);
	    }else{break;}}
	
		
	}
}
/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