// yukicoder 342 (http://yukicoder.me/problems/564)
#include<algorithm>
#include<iostream>
#include<locale>
#include<string>
#include<vector>
#define all(a) (a).begin(), (a).end()
#define rep(i,a) for(int i=0;i<(a);++i)

std::wstring S;
std::vector<std::wstring> ss;
std::vector<int> vs;

int main()
{
	std::locale::global( std::locale("") );

	std::wcin >> S;

	int idx = 0;
	while( idx < S.size() && S[idx] == L'ｗ' )
		++idx;

	int ma = 0;
	while( idx < S.size() )
	{
		std::wstring t;
		while( idx < S.size() && S[idx] != L'ｗ' )
			t += S[idx++];
		ss.push_back( t );

		int cnt = 0;
		while( idx < S.size() && S[idx] == L'ｗ' )
			++cnt, ++idx;
		vs.push_back( cnt );
		ma = std::max( ma, cnt );
	}

	bool fl = false;
	rep( i, vs.size() ) if( vs[i] == ma )
	{
		std::wcout << ss[i] << std::endl;
		
		fl = true;
	}

	if( !fl )
		std::wcout << "";

	return 0;
}