import java.util.Scanner;
class Main {
	public static void main(String[] args) {
		Scanner kb = new Scanner( System.in);	
		int data;
		for( int i=1; ; i++ ) {
			data=kb.nextInt();
			if( 0 != data ) {
				System.out.println( "Case "+i+": "+data );
			} else {
				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