#include<iostream>
using namespace std;
string s;
bool c(char a,char b,char c)
{
	string t="ｗ";
	return a==t[0]&&b==t[1]&&c==t[2];
}
main()
{
	cin>>s;
	int start=0;
	while(start<s.size()&&c(s[start],s[start+1],s[start+2]))start+=3;
	for(int k=s.size()/3*3;k>0;k-=3)
	{
		bool f=0;
		for(int i=start;i+k<=s.size();i+=3)
		{
			bool l=1;
			for(int j=0;j<k/3;j++)
			{
				l&=c(s[i+j*3],s[i+j*3+1],s[i+j*3+2]);
			}
			if(l)
			{
				f=1;
				int first=i;
				i-=3;
				while(i>=0&&!c(s[i],s[i+1],s[i+2]))i-=3;
				cout<<s.substr(i+3,first-i-3)<<endl;
				i=first;
			}
		}
		if(f)return 0;
	}
	cout<<""<<endl;
}