#include <bits/stdc++.h>
using namespace std;

int main() {
	int N; cin >> N;
	vector<int> A(N); for (int& a : A) cin >> a;
	
	int ans = 0;
	int y = 0;
	for (int x = 0; x < 4096; x++) {
		int w = 0, b = 0;
		for (int a : A) {
			if ((a|x) == x) w |= a;
			else b |= a;
		}
		if ((w&b) != 0) continue;
		if (ans < w * b) {
			ans = w * b;
			y = x;
		}
	}
	
	cout << ans << endl;
	for (int a : A) {
		if ((a|y) == y) cout << "W";
		else cout << "B";
	}
	cout << endl;
}