import java.util.Scanner;

public class Main {

    public static void main(String[] args) throws Exception {

        Scanner stdId = new Scanner(System.in);
        int a;
        int cnt = 0;

        while (true) {
            a = stdId.nextInt();
            if (a == 0) {
                break;
            } else {
                cnt++;
                System.out.println("Case " + cnt + ": " + a);
                //Case 1: 3
            }
        }
    }
}
/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