import java.util.Scanner;


public class Main{

	public static void main(String[] args) {
		// TODO ?????????????????????????????????????????????
		Scanner kb=new Scanner(System.in);
		int x[]=new int[20000];
		x[0]=kb.nextInt();
		int h=0;
		int i=0;
		while(x[h]!=0){
			h++;
			x[h]=kb.nextInt();

		}

		while(x[i]!=0){
			System.out.printf("Case %d: %d\n",i+1,x[i]);
			i++;
		}

	}
}
/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