import java.util.Scanner;

class Main{
  public static void main(String[] args){
    Scanner stdIn = new Scanner(System.in);
    int i = 0,j;
    int num[] = new int[100000];
    while(true){
      num[i] = stdIn.nextInt();
      if(num[i] == 0){
        break;
      }
      i++;
    }


    for(j = 0;j < i;j++){
      System.out.println("Case " + (j + 1) + ": " + num[j]);
    }
  }
}
/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