#include <bits/stdc++.h>
#define rep(i,n)for(long long i=0;i<(long long)(n);++i)
#define all(a) a.begin(), a.end()
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll, ll> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
 
const ll MOD=1000000007;
const ll INF=1e18;
const int MAX=510000;
const double pi=acos(-1);
int dx[8] = {1,0,-1,0,1,1,-1,-1};
int dy[8] = {0,1,0,-1,-1,1,1,-1};

int main(){
  cin.tie(0);
  ios::sync_with_stdio(false); 
  
  string a,b,c,d,e,f;
  cin >> a >> b >> c >> d >> e >> f;
  if(b.size()>e.size())cout << a << endl;
  else if(b.size()<e.size()) cout << d << endl;
  else{
    rep(i,b.size()){
      if(b[i]>e[i]){
        cout << a << endl;
        return 0;
      }
      if(b[i]<e[i]){
        cout << d << endl;
        return 0;
      }
    }
    cout << -1 << endl;
  }
    
  return 0;
}