import static java.lang.System.out;
import java.util.ArrayList;
import java.util.Scanner;

class PrintTestCases {
}

public class Main {
    public static void main(String... args) {
        ArrayList<Integer> data = new ArrayList<Integer>();

        // scan
        Scanner scan = new Scanner(System.in);
        while (scan.hasNext()) {
            data.add(scan.nextInt());
        }

        // print
        for (int i = 0; i < data.size(); i++) {
            if (data.get(i) == 0) break; // 0???????????????
            out.printf("Case %d: %d\n", i+1, data.get(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