#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)
#define range(a) a.begin(), a.end()

int main() {
  int N; cin >> N;
  ll X; cin >> X;
  vector<ll> A(N); rep(i, N) cin >> A[i];
  vector<ll> S(N + 1); rep(i, N) S[i + 1] = S[i] + A[i];
  vector<ll> R(N + 1); repr(i, N) R[i] = R[i + 1] + A[i];
  vector<vector<int>> dp(N, vector<int>(N));
  vector<vector<int>> eplr(N, vector<int>(N));
  vector<vector<int>> eprl(N, vector<int>(N));
  for (int d = 1; d <= N - 1; d++) {
    for (int l = 0; l + d <= N - 1; l++) {
      int r = l + d;
      eplr[l][r] = dp[l][l] + eplr[l + 1][r];
      eprl[r][l] = dp[r][r] + eprl[r - 1][l];
      // dpl[l][l+1]...dpl[l][l+x] -> 0
      // dpr[r][r]...dpr[r][r-y] -> 0
      int x = upper_bound(range(S), X + S[l]) - S.begin() - 1;
      int y = S.rend() - upper_bound(S.rbegin(), S.rend(), X + S[r + 1]) + 1;
      if (eplr[l][x] != x - l + 1) {
        dp[l][r] = 1;
      }
      if (eprl[r][y] != r - y + 1) {
        dp[l][r] = 1;
      }
    }
  }
  cout << (dp[0][N - 1] ? "A" : "B") << endl;
}