#include <bits/stdc++.h>
using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, b, a) for(int i = (b) - 1; i >= (a); i--)
#define SZ(a) (int)a.size()
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;

vector<string> ans[22];

char toLow(char x)
{
	return (x - 'A') + 'a';
}

int main()
{
    ios::sync_with_stdio(0); 
    cin.tie(0);
	cout << fixed << setprecision(15);
	string S;
	cin >> S;
	
	ans[0].PB("");
	
	FOR(i, 0, SZ(S))
	{
		char c = toLow(S[i]);
		for(auto s : ans[i])
			ans[i + 1].PB(s + c);
		
		if(i + 1 < SZ(S) && S[i] == 'S' && S[i + 1] == 'S')
		{
			for(auto s : ans[i])
				ans[i + 2].PB(s + "B");
		}
	}
	for(auto s : ans[SZ(S)])
		cout << s << "\n";
		
	
	
	return 0;
}