import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main{
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader bfr=new BufferedReader(new InputStreamReader(System.in));
		String str="";
		str=bfr.readLine();
		StringBuilder sb=new StringBuilder();
		sb.append(str);
		sb.setCharAt(3,'8');
		System.out.println(sb.toString());
	}
}
/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