#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    vector<int> a(n);
    rep(i,n) {
        cin >> a[i];
    }
    vector<vector<int>> dp(1<<12, vector<int>(1<<12));
    dp[0][0] = 1;
    rep(i,n) {
        vector<vector<int>> p(1<<12, vector<int>(1<<12));
        swap(dp, p);
        rep(j,1<<12)rep(k,1<<12) {
            if(p[j][k]==0) continue;
            dp[j|a[i]][k] = 1;
            dp[j][k|a[i]] = 1;
        }
    }
    int ans = 0;
    rep(i,1<<12)rep(j,1<<12) if(dp[i][j] && (i&j)==0) {
        ans = max(ans, i*j);
        dbg(i,j);
    }
    string fans;
    rep(i,1<<12)rep(j,1<<12) if(dp[i][j] && (i&j)==0 && i*j==ans)  {
        rep(k,n) {
            if(a[k]&i) fans+='W';
            else fans+='B';
        }
        cout << ans << endl;
        cout << fans << endl;
        return 0;
    }
    return 0;
}