#include <iostream>
#include <cstring>
#include <cmath>
#include <math.h>
#include <vector>
#include <queue>
using namespace std;

int main()
{
    int a, b, c;
    cin >> a >> b >> c;
    vector<int> v(a + b + c + 1, 0), v2;
    for(int i = 0; i < a; i++) {
        int x;
        cin >> x;
        v[x] = 1;
    }
    v2 = v;
    int n = (a + b + c);
    vector<int> ans(a + b + c + 1, 10);
    for(int mask = 0; mask <= (1 << n); mask++) {
        int tmpb = b;
        int tmpc = c;
        for(int i = 1; i <= n; i++) {
            if(v[i] == 1) {
                continue;
            }
            if(mask & (1 << i)) {
                tmpb--;
                v[i] = 2;
            }
            else {
                tmpc--;
                v[i] = 3;
            }
        }
        bool ok = true;
        if(tmpb == 0 and tmpc == 0) {
            for(int j = 1; j  + 1 <= n; j++) {
                if(v[j] == v[j+ 1] and v[j] != 0 and v[j + 1] != 0) {
                    ok = false;
                    break;
                }
            }
            if(ok) {
            
                ans = min(ans, v);
            }
        }
      
        v=v2;
    }
    for(int i = 1; i <= ans.size(); i++) {
        if(ans[i] == 1) {
            cout << 'A';
        }
        if(ans[i] == 2) {
            cout << 'B';
        }
        if(ans[i] == 3) {
            cout << 'C';
        }
    }
    if(ans[0] == 10) {
        cout << -1 << endl;
    }
    
    return 0;
}