import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);
    int in_num = 1;
    int scan_num = 0;

    while(true) {
      scan_num = stdIn.nextInt();
      if (scan_num == 0) {
        break;
      }
      System.out.println("Case "+ in_num + ": " + scan_num);
      in_num++;
    }
  }
}
/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