#include <bits/stdc++.h>
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define FORR(i,a,b) for (int i=(a);i>=(b);i--)
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef set<int> si;
const int inf = 1e9;
const int mod = 1e9+7;

main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n, d;
  cin >> n >> d;
  if(d > n){
    FOR(i, 0, 2 * n - d)cout << "A";
    FOR(i, 0, d - n)cout << "B";
  }else{
    FOR(i, 0, d)cout << "A";
    FOR(i, 0, n - d)cout << "C";
  }
  cout << endl;
}