#include <iostream>
#include <string>
#include <regex>
#include <exception>
using namespace std;
 
void parseDate(const string& date, int& year, int& month, int& day)
{
	regex dateValidateRe(R"(^(\d{4})\-(\d{1,2})\-(\d{1,2})$)");
	smatch matches;
	if (!regex_search(date, matches, dateValidateRe))
	{
		throw invalid_argument("Date format is incorrect");
	}
	year = stoi(matches[1]);
	month = stoi(matches[2]);
	day = stoi(matches[3]);
}
 
int main() {
	int year, month, day;
	string date;
	cin >> date;
	try
	{
		parseDate(date, year, month, day);
	}
	catch (std::exception& ex)
	{
		cout << "Invalid input: " << ex.what() << endl;
	}
	cout << "The date entered was Year = " << year << " Month = " << month << " Day = " << day << endl;
	return 0;
}

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MjAxOC00LTg=

2018-4-8