import java.util.Scanner;

class Main{
    public static void main(String[] a){
    	int c, no=0;
    	Scanner in = new Scanner(System.in);
      while (true){
      	c = in.nextInt();
      	if(c == 0) break;
      	no++;
        System.out.println("Case " + no + ": " + c);
      }
    }
}
/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