import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


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