import java.util.*;

class Main{
	public static void main(String[] args){
		Scanner scanner = new Scanner(System.in);

		int count = 1,x=1;
		while(x>0){
			x = scanner.nextInt();
			if(x==0){break;}
			System.out.println("Case "+count+ ": "+x);
			count++;
		}
	}
}
/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