Main.java

package com.olegchir.jlt;

import java.util.concurrent.atomic.AtomicReference;

public class Main {
    static AtomicReference<String> haystack = new AtomicReference<>("8".repeat(184));

    public static void main(String[] args) {
        while ( find("222") || find("888") ) {
            if ( find("222") ) {
                replace("222", "8");
            } else {
                replace("888", "2");
            }
        }
        System.out.println(haystack.get());
    }

    private static boolean find(String needle) {
        return haystack.get().contains(needle);
    }

    private static void replace(String old, String modern) {
        haystack.set(haystack.get().replace(old, modern));
    }
}