import java.util.Scanner;

public class Main{
 public static void main(String[] args){
 Scanner sc = new Scanner(System.in);
 for(int i=1;;i++){
 int x = sc.nextInt();
 if(x==0){
 break;
}
 System.out.printf("Case %d: %d\n",i,x);
}
}
}
/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