import java.io.*;

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