import java.util.Scanner;

public class Main {
    public static Scanner sc;
    public static void main(String[] args) throws Exception {
        sc = new Scanner(System.in);
        int n = 1;
        while (sc.hasNext()) {
            int i = sc.nextInt();
            if (i == 0) break;
            
            System.out.println("Case " + n + ": " + i);
            n++;
        }
    }
}
/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