import java.io.IOException;
import java.io.InputStreamReader;
import java.io.* ;
 
class Main{
  public static void main(String[] args)throws IOException{
      
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // ??\?????????
       String str = br.readLine();  //???????????????
       int r = Integer.parseInt(str); //???????????°?????????
  	   int i = 1;
  	while ( r != 0 ) {  
  		System.out.println(  "Case " + i + ": " + r);
 		i++;
        str = br.readLine();  //???????????????
        r = Integer.parseInt(str); //???????????°?????????
  	
  	}	
  		
  	}
  }
/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