#include <iostream>
#include <cstdlib>
#include <vector>

using namespace std;

int n;
vector<int> v[202020];
int q[202020];
int h[202020];

int main() {
    srand(1337);
    cin >> n;
    for (int i = 0; i < 5; i++) {
        int c;
        cin >> c;
        for (int j = 0; j < c; j++) {
            int a, b;
            cin >> a >> b;
            bool ok = true;
            for (int k = 0; k < v[a].size(); k++) {
                if (v[a][k] == b) ok = false;
            }
            if (!ok) continue;
            v[a].push_back(b);
            v[b].push_back(a);
        }
    }
    for (int i = 1; i <= n; i++) q[i] = rand()%2;

    for (int i = 1; i <= n; i++) h[i] = i;
    for (int i = 1; i <= n; i++) {
        swap(h[i], h[i+rand()%(n-i+1)]);
    }

    while (true) {
         bool ok = true;
         for (int x = 1; x <= n; x++) {
            int i = h[x];
            int a = q[i];
            int z = 0;
            for (int j = 0; j < v[i].size(); j++) {
                if (q[v[i][j]] == a) z++;
            }
            if (z <= 2) continue;
            ok = false;
            q[i] = 1-q[i];
         }
         if (ok) break;
    }
    for (int i = 1; i <= n; i++) {
        if (q[i] == 0) cout << "A";
        else cout << "B";
    }
    cout << "\n";
}