import java.io.IOException;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
      Scanner sc = new Scanner(System.in);
      int x,y;
      x = 1;
      y = 1;
      while(x != 0){
    	x = sc.nextInt();
    	if(x!=0){
    		System.out.println("Case "+y+": "+x);
    	}
    	y = y+1;
      }
	}

}
/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