import java.util.*;

public class Main {

	private static Scanner sc;

	public static void main(String[] args) {
	sc = new Scanner(System.in);
	int a = 1 ;
	int n =1;
	while(a!=0){
	    a =sc.nextInt();
	    if(a!=0){
		System.out.println("Case "+n+": "+a);
		n=n+1;
	    }
		
		
   	}
	


}
	
}
    	
/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