#include <bits/stdc++.h>
using namespace std;
using uint = unsigned int;
const uint MAX_A = bit_ceil((uint)4000);

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n; cin >> n;
    vector<uint> a(n);
    for (uint &x : a) cin >> x;
    vector<bool> col(n, false);
    uint ans = 0;
    for (uint i = 1; i < MAX_A; i++) {
        uint w = 0, b = 0;
        vector<bool> tmp(n, false);
        for (int j = 0; j < n; j++) {
            if ((i & a[j]) == 0) {
                b |= a[j];
                tmp[j] = true;
            } else if ((i & a[j]) == a[j]) {
                w |= a[j];
            } else {
                w = 0; b = 0;
                break;
            }
        }
        if (w * b > ans) {
            ans = w * b;
            col = tmp;
        }
    }
    cout << ans << "\n";
    for (int i = 0; i < n; i++) {
        cout << (col[i] ? "W" : "B");
    }
    cout << endl;
    return 0;
}