import java.io.*;

class Main{
    public static void main(String[] args)throws IOException{
        int i = 0, x;

        InputStreamReader isr =new InputStreamReader(System.in);
   		BufferedReader br =new BufferedReader(isr);
    	String buf = br.readLine();
    	x = Integer.parseInt(buf);
        
        while(true) {
        	if (x == 0) break;
            i++;
        	System.out.printf("Case %d: %d\n", i, x);
        	buf = br.readLine();
    		x = Integer.parseInt(buf);
    	}
    }
}
/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