import java.util.*;

class Main {
   public static void main(String[] args)
   {
      Scanner       scan = new Scanner(System.in);
      String        st   = scan.next();
      StringBuilder str  = new StringBuilder(st);

      str.setCharAt(3, '8');

      System.out.println(str);
   }
}

/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