#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

bool check(const string& S){
  if(S[0] == S[1] || S[1] == S[2] || S[0] == S[2]) return false;

  if(S[0] > S[1] && S[1] < S[2]) return true;
  if(S[0] < S[1] && S[1] > S[2]) return true;
  return false;
}

int main(){
  string S(3,'?');
  rep(i,3) cin >> S[i];

  bool one = false, four = false;
  rep(i,3){
    if(S[i] == '?'){
      string T = S;
      T[i] = '1';
      if(check(T)) one = true;
      T[i] = '4';
      if(check(T)) four = true;
    }
  }

  if(one) cout << 1;
  if(four) cout << 4;
  cout << endl;
  
  return 0;
}