import java.util.ArrayList;
import java.util.Scanner;


public class Main {
	public static void main(String[] args) {
		ArrayList<Integer> caseNum = new ArrayList<Integer>();
		int num;
		Scanner sc = new Scanner(System.in);

		//??\??????????????????0?????§??°?????????
		while (sc.hasNext()) {
			num=sc.nextInt();

			//0??\??????????????????
			if(num==0){
				break;
			}
			//??\???????????´??°?????????????????????
			caseNum.add(num);
		}
		//??\???????????´??°?????¨???
		for (int i = 0; i < caseNum.size(); i++) {
			System.out.println("Case "+(i+1)+": "+caseNum.get(i).intValue());
		}
	}
}
/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