import java.util.*;
public class Main {
    public static void main(String[] args){
        Scanner sca=new Scanner(System.in);
        String num[]=new String[10001];
        for(int i=0;;i++){
            num[i] =sca.next();
            if(num[i].equals("0"))break;
        }
        for(int i=1;;i++){
            if(num[i-1].equals("0"))break;
            System.out.println("Case "+i+": "+num[i-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