public class Main {
			
				
		public static void main(String[] args) {
		java.util.Scanner scan = new java.util.Scanner(System.in);
		int x;
		int i = 0;
		while(true){
		x = scan.nextInt();
		i+= 1;
			if(1<=x && x<= 10000){
			System.out.println("Case "+i+": "+x);
			
			}
		if(x == 0){
			break;
		}
		}
		}
					
					
					
		}
/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