#include <bits/stdc++.h>
#define fastIO ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int long long
const int N = 1e6 +2;using namespace std;

set<string> ans;
string s;

void Try(int id, string res)
{
	if(id == s.size() - 1){
		ans.insert(res + s[id]);
		return;
	}
	if(s[id] == 's' && s[id + 1] == 's'){
		Try(id + 2, res + "B");
	}
	Try(id + 1, res + s[id]);
}


void solve(){
	cin >> s;
	for(char &x : s) x += 32;
	Try(0, "");
	for(auto x : ans) cout << x << endl;
}
signed main() {
	int T = 1;
//	cin >> T;
	while (T--) solve();
	
	return 0;
}