#include <stack>
#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <numeric>

using namespace std;

using ll = long long;

#define REP(i,n) for(ll i=0;i<(ll)(n);i++)
#define REPD(i,n) for(ll i=n-1;i>=0;i--)
#define FOR(i,a,b) for(ll i=a;i<=(ll)(b);i++)
#define FORD(i,a,b) for(ll i=a;i>=(ll)(b);i--)

#define input(...) __VA_ARGS__; in(__VA_ARGS__)

#if __has_include("debugger.cpp")
  #include "debugger.cpp"
#else
void print() {
  std::cout << std::endl;
}

template <class Head, class... Tail>
void print(Head&& head, Tail&&... tail) {
  cout << head;
  if (sizeof...(tail) > 0) cout << " ";
  print(std::forward<Tail>(tail)...);
}
# endif

void in() { }

template <class Head, class... Tail>
void in(Head&& head, Tail&&... tail) {
  cin >> head;
  in(std::forward<Tail>(tail)...);
}

int main() {
  string input(s);
  stack<char> p;
  REP(i, s.size()) {
    if (s[i] == 'T' && !p.empty() && p.top() == 'S') {
      p.pop();
    } else {
      p.push(s[i]);
    }
  }

  print(p.size());
}

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define In_The_Name_Of_Allah_The_Merciful ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define Alhamdulillah return 0;
#define all(v) v.begin(),v.end()
#define debug(n) cerr << "[" << #n << " = " << n << "]" << endl 

void Suhaib_Sawalha (){

    string s , w;
    cin >> s >> w;
    cout << w + s;

}

int main(){
                                In_The_Name_Of_Allah_The_Merciful   /* بسم الله الرحمن الرحيم  */
#ifndef ONLINE_JUDGE
    freopen("SuhaibSawalha1.txt","r",stdin);
#endif
//int _;for(cin>>_;_;--_,cout<<'\n')
        Suhaib_Sawalha();
                                         Alhamdulillah                    /* الحمد لله */
}