#include <bits/stdc++.h>
#define EPS 1e-9
#define INF 1070000000LL
#define MOD 1000000007LL
#define fir first
#define foreach(it,X) for(auto it=(X).begin();it!=(X).end();it++)
#define numa(x,a) for(auto x: a)
#define ite iterator
#define mp make_pair
#define rep(i,n) rep2(i,0,n)
#define rep2(i,m,n) for(int i=m;i<(n);i++)
#define pb push_back
#define pf push_front
#define sec second
#define sz(x) ((int)(x).size())
#define ALL( c ) (c).begin(), (c).end()
#define gcd(a,b) __gcd(a,b)
#define mem(x,n) memset(x,n,sizeof(x))
#define endl "\n"
using namespace std;
template <int POS, class TUPLE> void deploy(std::ostream &os, const TUPLE &tuple){}
template <int POS, class TUPLE, class H, class ...Ts> void deploy(std::ostream &os, const TUPLE &t){ os << (POS == 0 ? "" : ", ") << get<POS>(t); deploy<POS + 1, TUPLE, Ts...>(os, t); }
template <class T,class U> std::ostream& operator<<(std::ostream &os, std::pair<T,U> &p){ os << "(" << p.first <<", " << p.second <<")";return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::vector<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T> std::ostream& operator<<(std::ostream &os, std::set<T> &v){ int remain = v.size(); os << "{"; for(auto e: v) os << e << (--remain == 0 ? "}" : ", "); return os; }
template <class T, class K> std::ostream& operator<<(std::ostream &os, std::map<T, K> &mp){ int remain = mp.size(); os << "{"; for(auto e: mp) os << "(" << e.first << " -> " << e.second << ")" << (--remain == 0 ? "}" : ", "); return os; }
#define DEBUG1(var0) { std::cerr << (#var0) << "=" << (var0) << endl; }
#define DEBUG2(var0, var1) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG1(var1); }
#define DEBUG3(var0, var1, var2) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG2(var1,var2); }
#define DEBUG4(var0, var1, var2, var3) { std::cerr << (#var0) << "=" << (var0) << ", ";DEBUG3(var1,var2,var3); }
using ll = long long;

vector <int> edge[100100];
int N;
string S;
ll c[100100];
ll w[100100];
ll C, W;
ll ans;
void dfs(int v, int par = -1) {
  ll tmpc = 0;
  ll tmpw = 0;
  ll tmpW = W;
  ll tmpC = C;
  numa(nv, edge[v]) {
    if (nv == par) {
      continue;
    }
    dfs(nv, v);
    if (S[v] == 'w') {
      ans += (long long) c[nv] * (tmpW - w[nv] - 1);
      ans += (long long) (tmpC - c[nv]) * w[nv];
      tmpW -= w[nv];
      tmpC -= c[nv];
    }
    tmpc += c[nv];
    tmpw += w[nv];
  }
  if (S[v] == 'w') {
    tmpw++;
  } else {
    tmpc++;
  }
  c[v] = tmpc;
  w[v] = tmpw;
}
                               
int main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cin >> N;
  cin >> S;
  C = 0; W = 0;
  ans = 0;
  numa(c,S){
    if (c == 'c') {
      C++;
    } else {
      W++;
    }
  }

  rep(i,N-1){
    int x,y;
    cin >> x >> y;
    x--; y--;
    edge[x].pb(y);
    edge[y].pb(x);
  }
  dfs(0);
  cout << ans << endl;
  
  return 0;
}