import java.io.IOException;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws IOException{
		int t =0;
		Scanner sc = new Scanner(System.in);
		while(true){
			int x =sc.nextInt();
			if(x == 0) break;
			t++;
			System.out.println("Case "+ t + ": " + x );
		}
        
        
	}
}
/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