#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vi vector<ll>
#define vvi vector<vector<ll>>
#define vs vector<string>
#define vc vector<char>
#define vb vector<bool>
#define vp vector<pair<ll, ll>>
#define vpp vector<pair<ll, pair<ll, ll>>>
#define pp pair<ll, ll>
#define qi queue<ll>
#define qp queue<pp>
#define pqi priority_queue<ll>
#define pqp priority_queue<pp>
#define mi map<ll, ll>
#define mpi map<pp, ll>
#define mip map<ll, pp>
#define mp map<pp, pp>
#define mb map<ll, bool>
#define si set<ll>
#define sp set<pp>
#define sc set<char>
#define mod 1000000007
#define inf INT_MAX
#define all(x) (x).begin(), (x).end()
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
vp a(n);
vc type(n);
vector<pair<pp, ll>> north, south, east, west;
for(int i = 0; i < n; i++) {
cin >> a[i].first >> a[i].second >> type[i];
if(type[i] == 'N') {
north.push_back({a[i], i});
}
else if(type[i] == 'S') {
south.push_back({a[i], i});
}
else if(type[i] == 'W') {
west.push_back({a[i], i});
}
else {
east.push_back({a[i], i});
}
}
vector<pair<ll, pp>> deaths;
for(int i = 0; i < east.size(); i++) {
auto[x1, y1] = east[i].first;
ll ind1 = east[i].second;
for(int j = 0; j < south.size(); j++) {
auto[x2, y2] = south[j].first;
ll ind2 = south[j].second;
if(x1 >= x2) continue;
if(y1 <= y2) continue;
ll time1 = abs(x1 - x2);
ll time2 = abs(y1 - y2);
if(time1 == time2) {
deaths.push_back({time1, {ind1, ind2}});
}
}
for(int j = 0; j < north.size(); j++) {
auto[x2, y2] = north[j].first;
ll ind2 = north[j].second;
if(x1 >= x2) continue;
if(y1 >= y2) continue;
ll time1 = abs(x1 - x2);
ll time2 = abs(y1 - y2);
if(time1 == time2) {
deaths.push_back({time1, {ind1, ind2}});
}
}
}
for(int i = 0; i < west.size(); i++) {
auto[x1, y1] = west[i].first;
ll ind1 = west[i].second;
for(int j = 0; j < south.size(); j++) {
auto[x2, y2] = south[j].first;
ll ind2 = south[j].second;
if(x1 <= x2) continue;
if(y1 <= y2) continue;
ll time1 = abs(x1 - x2);
ll time2 = abs(y1 - y2);
if(time1 == time2) {
deaths.push_back({time1, {ind1, ind2}});
}
}
for(int j = 0; j < north.size(); j++) {
auto[x2, y2] = north[j].first;
ll ind2 = north[j].second;
if(x1 <= x2) continue;
if(y1 >= y2) continue;
ll time1 = abs(x1 - x2);
ll time2 = abs(y1 - y2);
if(time1 == time2) {
deaths.push_back({time1, {ind1, ind2}});
}
}
}
for(int i = 0; i < south.size(); i++) {
auto[x1, y1] = south[i].first;
ll ind1 = south[i].second;
for(int j = 0; j < north.size(); j++) {
auto[x2, y2] = north[j].first;
ll ind2 = north[j].second;
if(x1 != x2) continue;
if(y1 >= y2) continue;
ll time = abs(y1 - y2) / 2;
deaths.push_back({time, {ind1, ind2}});
}
}
for(int i = 0; i < east.size(); i++) {
auto[x1, y1] = east[i].first;
ll ind1 = east[i].second;
for(int j = 0; j < west.size(); j++) {
auto[x2, y2] = west[j].first;
ll ind2 = west[j].second;
if(y1 != y2) continue;
if(x1 >= x2) continue;
ll time = abs(x1 - x2) / 2;
deaths.push_back({time, {ind1, ind2}});
}
}
sort(all(deaths));
si left;
for(int i = 0; i < n; i++) left.insert(i);
for(int i = 0; i < deaths.size();) {
ll curTime = deaths[i].first;
si del;
while(i < deaths.size() && deaths[i].first == curTime) {
ll ind1 = deaths[i].second.first, ind2 = deaths[i].second.second;
if(!left.count(ind1) || !left.count(ind2)) {
i++;
continue;
}
del.insert(ind1);
del.insert(ind2);
i++;
}
for(auto x : del) left.erase(x);
}
for(auto x : left) cout << x + 1 << '\n';
return 0;
}
