import java.util.Scanner;

class Main {


    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);        
        StringBuilder sb = new StringBuilder();
        sb.append(sc.next());
        sb.setCharAt(3, '8');
        System.out.println(sb);
        sc.close();
    }
}
/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