#include <fstream>
#include <iostream>
#include <list>

using namespace std;

template <typename T1, typename T2>
list<T1> createList(T2& in) {
	T1 x;
	list<T1> lst;
	while (in >> x && in.peek() != '\n') {
		lst.push_back(x);
	}
	lst.push_back(x);
	return lst;
}

template <typename T>
void reformList(T x, T y, list<T>& lst) {
	for (auto it = lst.begin(); --it != lst.end(); ++it) {
		if (*it == x) lst.insert(++it, y);
	}
}

template <typename T>
void printList(list<T>& lst) {
	for (auto elem : lst) {
		cout << elem << " ";
	}
	cout << endl;
}

int main() {
	ifstream in("input.txt");
	list<int> lst = createList<int>(in);
	int x, y;
	in >> x >> y;
	reformList(x, y, lst);
	printList(lst);
	in.close();
	return 0;
}