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


class Main {
	public static void main(String[] args) throws IOException {
		ArrayList<String> ss = new ArrayList<String>();
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		while(true){
			String i = new String(in.readLine());
			if(i.equals("0")){
				break;
			}
			else{
				ss.add(i);
			}
			
		}
		for(int i = 0;i < ss.size() ;i++){
			System.out.println("Case "+(i+1)+": " + ss.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