4 zad

#include <iostream>
#include <string>

std::string readInput() {
	std::string line;
	getline(std::cin, line);
	return line;
}

void replaceWords(std::string& sentence, std::string findWord, std::string replaceWord) {


		size_t pos;
		size_t len = findWord.length();

		while ((pos = sentence.find(findWord)) != std::string::npos) {
			sentence.replace(pos, len, replaceWord);
		}
}


int main() {

	std::string sentence = readInput();
	std::string findWord = readInput();
	std::string replaceWord = readInput();

	replaceWords(sentence, findWord, replaceWord);

	std::cout << sentence;
}