import java.util.*;

class PrintTestCases {
    public static void main(String...args) {
        final Scanner sc = new Scanner(System.in);
        for (int t = 1; ; t++) {
            final int x = sc.nextInt();
            if(x == 0)
                break;
            System.out.printf("Case %d: %d\n", t, x);
        }
    }
}
public class Main {
    public static void main(String... args) {
        PrintTestCases.main();
    }
}
/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