import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringBuilder sb = new StringBuilder();
    int caseNum = 1;
    while(true) {
      int data = Integer.parseInt(br.readLine());
      if(data == 0) {
        break;
      }
      sb.append("Case ").append(Integer.toString(caseNum++)).append(": ").append(Integer.toString(data)).append("\n");
    }
    System.out.print(sb);
  }
}
/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