#include <iostream>
#include <iterator>
#include <algorithm>
#include <locale>

int main(int, char**)
{
	using iterator = std::istream_iterator<std::string>;
	auto const& end = iterator();
	
	for (auto it = iterator(std::cin); it != end; ++it) {
		auto const& token = *it;
		if (std::all_of(std::begin(token), std::end(token), [](auto&& c) { return std::isdigit(c, std::locale()); })) {
			std::cout << std::string(token.size(), 'x') << " ";
		} else {
			std::cout << token << " ";
		}
	}
    
    return 0;
}