#include <bits/stdc++.h>
 
using namespace std;
using ll = long long;
#define int ll
using PII = pair<int, int>;
 
#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
 
template<typename T> T &chmin(T &a, const T &b) { return a = min(a, b); }
template<typename T> T &chmax(T &a, const T &b) { return a = max(a, b); }
template<typename T> bool IN(T a, T b, T x) { return a<=x&&x<b; }
template<typename T> T ceil(T a, T b) { return a/b + !!(a%b); }

template<typename T> vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts) { 
  return vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}
template<typename T,typename V> typename enable_if<is_class<T>::value==0>::type
fill_v(T &t, const V &v) { t=v; }
template<typename T,typename V> typename enable_if<is_class<T>::value!=0>::type
fill_v(T &t, const V &v ) { for(auto &e:t) fill_v(e,v); }

template<class S,class T>
ostream &operator <<(ostream& out,const pair<S,T>& a){
  out<<'('<<a.first<<','<<a.second<<')'; return out;
}
template<typename T>
istream& operator >> (istream& is, vector<T>& vec){
  for(T& x: vec) {is >> x;} return is;
}
template<class T>
ostream &operator <<(ostream& out,const vector<T>& a){
  out<<'['; for(T i: a) {out<<i<<',';} out<<']'; return out;
}

int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0}; // DRUL
const int INF = 1<<30;
const ll LLINF = 1LL<<60;
const int MOD = 1000000007;

int pos;
string s;

char formula() {
  if(s[pos] == '-') {
    pos++;
    char tmp = formula();
    // cout << pos << " " << tmp << endl;
    if(tmp == 'F') tmp = 'T';
    else tmp = 'F';
    // cout << pos << " " << tmp << endl;
    return tmp;
  } 
  if(s[pos] == '(') {
    pos++;
    char vl = formula();
    char op = s[pos++];
    if(op == '-') pos++;
    char vr = formula();
    if(s[pos] != ')') assert(false);
    pos++;

    char ret;
    // cout << op << endl;
    if(op == '*') {
      if(vl == 'T' && vr == 'T') ret = 'T';
      else ret = 'F';
    } else if(op == '+') {
      if(vl == 'F' && vr == 'F') ret = 'F';
      else ret = 'T';
    } else if(op == '-') {
      if(vl == 'T' && vr == 'F') ret = 'F';
      else ret = 'T';
    }
    return ret;
  }
  return s[pos++];
}

signed main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);

  while(1) {
    string t;
    cin >> t;
    if(t == "#") break;

    int m = 0;
    map<char,int> mp;
    REP(i, t.size()) {
      if(isalpha(t[i]) && t[i]!='T' && t[i]!='F') {
        if(mp.find(t[i]) == mp.end()) mp[t[i]] = m++;
      }
    }
    REP(i, t.size()) {
      if(isalpha(t[i]) && t[i]!='T' && t[i]!='F') {
        t[i] = (char)(mp[t[i]] + 'a');
      }
    }

    bool flag = true;
    REP(i, 1LL<<m) {
      string str = t;
      REP(j, str.size()) {
        if(isalpha(str[j]) && t[j]!='T' && t[j]!='F') {
          if(i&(1<<(str[j]-'a'))) str[j] = 'T';
          else str[j] = 'F';
        }
      }

      int idx = str.find('=');
      pos = 0;
      s = str.substr(0, idx);
      // cout << s << endl;
      char vl = formula();
      // cout << vl << endl;
      pos = 0;
      s = str.substr(idx+1);
      // cout << s << endl;
      char vr = formula();
      // cout << vr << endl;

      if(vl != vr) {
        flag = false;
        break;
      }
    }

    if(flag) {
      cout << "YES" << endl;
    } else {
      cout << "NO" << endl;
    }
  }

  return 0;
}



Measured memory_bytes: 3232