import java.util.Scanner;
 
class Main {
    public static void main(String args[]) {
        StringBuilder sb = new StringBuilder();
        Scanner scanner = new Scanner(System.in);
  
        int i = 0;
        while (true) {
            i++;
            int x = scanner.nextInt();
            if(x == 0) {
                break;                                              
            }
            sb.append("Case").append(" ").append(i + ":").append(" ").append(x).append("\n");

        }  
            System.out.print(sb);
            sb.setLength(0);
    }
}
/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