import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br =
            new BufferedReader(new InputStreamReader(System.in), 1);
        String x;
        int i = 1;
        while(true){
        	x = br.readLine();
        	if (x.equals("0"))
        		return;
        	System.out.println("Case " + i + ": " + x);
        	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