#include <algorithm>
#include <cctype>
#include <iostream>
#include <regex>
#include <string>
#include <unordered_map>
 
int main()
{
	const std::string str = "Eniki,beniki, eli vareniki; Eli i eli poka ne doeli beniki vareniki.";
	const std::regex reg("\\w+");
 
	std::unordered_map<std::string, int> words;
	for (std::sregex_iterator next(str.begin(), str.end(), reg), end; next != end; ++next)
	{
		std::string word = next->str();
		std::transform(word.begin(), word.end(), word.begin(), tolower);
		++words[word];
	}
 
	for (auto p : words)
		std::cout << p.first << " " << p.second << std::endl;
}

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