#include <bits/stdc++.h>
 
using namespace std;
 
int main() {
	string str;
	getline(cin,str);
	vector<int> tmp,tmp2;
	str="."+str+".";
	for_each(str.begin(), str.end(), [&](char& n){if (n == '.')	tmp.push_back(&n - &str[0]);});
	tmp2.resize(tmp.size());
	copy(tmp.begin() + 1, tmp.end(),tmp2.begin());
	transform (tmp2.begin(), tmp2.end(), tmp.begin(), tmp2.begin(), std::minus<int>());
	auto pos = max_element(tmp2.begin(),tmp2.end());
	int poss = *(tmp.begin() + (pos - tmp2.begin())) + 1;
	copy(str.begin() + poss, str.begin() + poss + *pos, ostream_iterator<char>(cout));
	return 0;
}

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