import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner scanner = new Scanner(System.in);
    ArrayList<Integer> n = new ArrayList<Integer>();

    while(scanner.hasNextInt()){
      int x = scanner.nextInt();
      if(x == 0){
        break;
      }
      n.add(x);
    }
    for (int i = 0; i < n.size(); i++){
      System.out.println("Case " + (i + 1) + ": " + n.get(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