import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


public class Main{

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

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int i=0;
		int num = 1;
		while(true){
			String str = br.readLine();
			num = Integer.parseInt(str);

				if(num == 0){
					break;
				}
				else if(num != 0){
					i++;
					System.out.println("Case " + i + ": " + num);
				}
		}
	}
}
/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