#nullable enable

#region
var _input = Array.Empty<string>();
var _iter = 0;
string String()
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Split(' '), 0);
    return _input[_iter++];
}
T I<T>() where T : IParsable<T> => T.Parse(String(), null);
#endregion

T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();

var n = I<int>();
var az = Range(n, I<int>).AsSpan();
var k = 12.ToFlag();
var ans = -1;
var fns = new bool[n];
for (var wt = 0; wt < k; wt++)
{
    var bns = new bool[n];
    var w = 0;
    var b = 0;
    for (var i = 0; i < n; i++)
    {
        var a = az[i];
        var and = bns[i] = (a & wt) == 0;
        if (and) b |= a;
        else w |= a;
    }
    var p = w * b;
    if (w == wt && p > ans)
    {
        ans = p;
        fns = bns;
    }
}
var sns = fns.Select(f => f ? 'B' : 'W');
Console.WriteLine(ans);
Console.WriteLine(new string(sns.ToArray()));

static class BitExtensions
{
    public static int ToFlag(this int i)
    {
        if (i < 0 || 31 <= i) throw new IndexOutOfRangeException();
        return 1 << i;
    }
    public static bool OfFlag(this int value, int i) => (value & ToFlag(i)) > 0;
    public static int WithFlag(this int value, int i, bool f) => f ? (value | ToFlag(i)) : (value & ~ToFlag(i));
}