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

class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		int i=0;
		while(true){
        	int x=Integer.parseInt(br.readLine());
        	if(x==0) break;
    		i++;
    		System.out.println("Case "+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