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

#define endl '\n'
#define lfs cout<<fixed<<setprecision(10)
#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()
#define spa << " " <<
#define test cout<<"test"<<endl;
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = (n); i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = (m) - 1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD = 1e9+7;
//const ll MOD = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T>
void chmin(T &a,T b){if(a>b)a=b;}
template<typename T>
void chmax(T &a,T b){if(a<b)a=b;}
void pmod(ll &a,ll b){a=(a+b)%MOD;}
void pmod(ll &a,ll b,ll c){a=(b+c)%MOD;}
void qmod(ll &a,ll b){a=(a*b)%MOD;}
void qmod(ll &a,ll b,ll c){a=(b*c)%MOD;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>
void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}  
template<typename T>
void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>&v,ll h,ll w){for(ll i=0;i<h;i++)
{for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>
void debug(vector<T>&v,ll n){if(n!=0)cout<<v[0];
for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>
vector<vector<T>>vec(ll x, ll y, T w){
  vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
vector<ll>dx={1,0,-1,0,1,1,-1,-1};
vector<ll>dy={0,1,0,-1,1,-1,1,-1};
template<typename T>
vector<T> make_v(size_t a,T b){return vector<T>(a,b);}
template<typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v(ts...))>(a,make_v(ts...));
}
ostream &operator<<(ostream &os, pair<ll, ll>&p){
  return os << p.first << " " << p.second;
}  
int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res=0,buf=0;
  bool judge = true;
  ll n,m;cin>>n>>m;
  vector<P>d(n);
  vector<P>d2(n);
  rep(i,0,n){
    cin>>d[i].fi;d[i].se=i;
  }
  d2=d;
  vector<vector<P>>g(n);
  rep(i,0,m){
    ll u,v;cin>>u>>v;u--;v--;
    g[u].EB(v,i);
    g[v].EB(u,i);
  }
  string s(n,'-');
  vector<ll>ret(m);
  sort(ALL(d));
  rep(i,0,n){
    if(s[d[i].se]!='-')continue;
    //cout<<d[i].se<<endl;
    for(auto to:g[d[i].se]){
      if(d2[to.fi].fi<=d[i].fi){
        if(s[to.fi]=='-'){
          s[d[i].se]='B';
          s[to.fi]='W';
        }
        else{
          if(s[to.fi]=='B')s[d[i].se]='W';
          else s[d[i].se]='B';
        }
        ret[to.se]=d[i].fi;
        break;
      }
      if(s[to.fi]!='-'&&d2[to.fi].fi<d[i].fi){
        s[d[i].se]=s[to.fi];
        ret[to.se]=d[i].fi-d2[to.fi].fi;
        break;
      }
    }
    if(s[d[i].se]=='-')judge=false;
  }
  if(judge){
    cout<<s<<endl;
    rep(i,0,m){
      if(ret[i]==0)cout<<(ll)1e9<<endl;
      else cout<<ret[i]<<endl;
    }
  }
  else cout<<-1<<endl;
  return 0;
}

Measured memory_bytes: 19200