import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws Exception {
        // Here your code !
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String x;
        int i=1;
        
        while(true){
            x = reader.readLine();
            if(Integer.parseInt(x)==0){
                break;
            }
            System.out.println("Case "+i+": "+Integer.parseInt(x));
            i++;
        }
    }
}
/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