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

enum validation:int{
  CORRECT = 42,
  WRONG_ANSWER = 43,
  JUDGE_ERROR = 1,
};

enum answer:int{
  INVALID = -1,
  IMPOSSIBLE = -2,
};

int main(int argc, char** argv) {
	ifstream data(argv[1]);
	ifstream jury(argv[2]);
  istream &team=cin;

  if (argc==4){
    freopen((string(argv[3]) + "/feedback.txt").c_str(), "w", stdout);
  } else if (argc!=3){
    cerr<<"usage: "<<argv[0]<<" data.in jury.ans (./feedback) < team.ans"<<endl;
    return 1;
  }

  bool lt[26][26]={};
  int orig_n;
  if (not (data>>orig_n)){
    cout<<"Unable to read input"<<endl;
    return JUDGE_ERROR;
  }
  for (int i=0; i<orig_n; i++){
    char a,b,c;
    if (not (data>>a>>c>>b)){
      cout<<"Unable to read input"<<endl;
      return JUDGE_ERROR;
    }
    if (c=='>') swap(a,b);
    lt[a-'a'][b-'a']=true;
  }
  string orig_str;
  if (not (data>>orig_str)){
    cout<<"Unable to read input"<<endl;
    return JUDGE_ERROR;
  }

  string jury_answer;
  if (not (jury>>jury_answer)){
    cout<<"Unable to read jury answer"<<endl;
    return JUDGE_ERROR;
  }
  
  string team_answer;
  if (not (team>>team_answer)){
    cout<<"Unable to read team answer"<<endl;
    return WRONG_ANSWER;
  }

  // First of all check the case in which team thinks the task is impossible
  if (team_answer=="IMPOSSIBLE"){
    if (jury_answer=="IMPOSSIBLE"){
      return CORRECT;
    }else{
      cout<<"Team says IMPOSSIBLE but jury has an answer"<<endl;
      return WRONG_ANSWER;
    }
  }

  // Team must output same set of letters as input.
  {
    string a=team_answer,b=orig_str;
    sort(a.begin(),a.end());
    sort(b.begin(),b.end());
    if (a!=b){
      cout<<"Team answer contains different set of letters from input"<<endl;
      return WRONG_ANSWER;
    }
  }

  // Team ordering must match all requirements.
  vector<pair<int,int>> fl(26,{-1,-1});
  for (int i=0; i<team_answer.size(); i++) fl[team_answer[i]-'a'].second=i;
  for (int i=team_answer.size(); i--;)     fl[team_answer[i]-'a'].first=i;
  for (int i=26; i--;)
    for (int j=26; j--;)
      if (lt[i][j] and fl[i].second>=fl[j].first){
        cout<<"Team has wrong order for letters "<<((char)(i+'a'))<<" < "<<((char)(j+'a'))<<endl;
        return WRONG_ANSWER;
      }

  // Was the output supposed to be IMPOSSIBLE?
  if (jury_answer=="IMPOSSIBLE"){
    cout<<"Team answer is valid but jury answer was IMPOSSIBLE"<<endl;
    return JUDGE_ERROR;
  }else{
    return CORRECT;
  }
}