#include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     map<char, int> mp;     mp.insert(pair<char, int>( A , 0));     mp.insert(pair<char, int>( B , 0));     mp.insert(pair<char, int>( C , 0));     int i = 3;     while (i--) {       string s;       cin >> s;       if (s[1] ==  > )         mp[s[0]]++;       else         mp[s[2]]++;     }     if (mp[ A ] == mp[ B ] && mp[ C ] == mp[ B ])       cout <<  Impossible ;     else {       if (mp[ A ] == 0)         cout <<  A ;       else if (mp[ B ] == 0)         cout <<  B ;       else if (mp[ C ] == 0)         cout <<  C ;       if (mp[ A ] == 1)         cout <<  A ;       else if (mp[ B ] == 1)         cout <<  B ;       else if (mp[ C ] == 1)         cout <<  C ;       if (mp[ A ] == 2)         cout <<  A ;       else if (mp[ B ] == 2)         cout <<  B ;       else if (mp[ C ] == 2)         cout <<  C ;     }     return 0;   }   