import java.util.*;

class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int num[] = new int[10000];
		int cnt = 0, input;
		
		while(true){
			if((input = sc.nextInt()) == 0)
				break;
			num[cnt] = input;
			cnt ++;
		}
		
		for(int i = 0; i < cnt; i++)
			System.out.println("Case " + (i+1) + ": " + num[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