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


public class Main {
	public static void main(String[] args) throws Exception {
try {
	BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
	int x = Integer.parseInt(buf.readLine());
	int count = 1;
	
	while(x != 0){
		System.out.println("Case " + count + ": " + x);
		x = Integer.parseInt(buf.readLine());
		count ++;
	}
} catch (Exception e) {
	// TODO: handle 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