#include <iostream>
#include <iterator>
#include <vector>
#include <string>
#include <algorithm>
 
int main() {
 
	std::vector<std::string> result;
 
	std::istream_iterator<std::string> iit(std::cin);
 
	while( iit != std::istream_iterator<std::string>() )
	{
		if( result.empty() )
		{
			result.push_back( *iit );
		}
		else
		{
			size_t newLen = iit->length();
			size_t oldLen = result[0].length();
 
			if( newLen >= oldLen )
			{
				if( newLen > oldLen )
				{
					result.clear();
				}
				result.push_back( *iit );
			}
		}
		++iit;
	}
 
 
	if( !result.empty() )
	{
		std::cout << "max length: " << result[0].length() << std::endl;
	}
 
	for( auto& s : result )
	{
		std::cout << s << std::endl;
	}
 
	return 0;
}

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VGhlIHF1aWNrIGJyb3duIGZveCBqdW1wcyBvdmVyIHRoZSBsYXp5IGRvZw==

The quick brown fox jumps over the lazy dog