import java.io.*;

class Main {
	public static void main (String args[]) {
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String buf;
		int count = 1;

		try {
			while (true) {
				buf = br.readLine();
				if (Integer.parseInt(buf)==0) break;
				System.out.println("Case "+count+": "+Integer.parseInt(buf));
				count++;
			}
		} catch (Exception e) {
			//Exception
		}
	}
}
/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