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));
        String strArr;
        int a;
        int times=0;

        while(true){
        	times++;
        	strArr = br.readLine();
            a=Integer.parseInt(strArr);

            if(a!=0){
            	System.out.println("Case "+times+": "+a);
            }
            else{
            	System.exit(0);
            }
        }
    }
}
/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