#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int MOD = 1e9 + 7;
const int INF = 1e9;
const int MAX_N = 1e5 + 5;
void solve() {
int n; cin >> n;
int x[n],y[n];
char d[n];
for(int i=0; i<n; i++) {
cin >> x[i] >> y[i] >> d[i];
}
if(n <= 5000) {
vector<vector<ll>> sudar(n+1, vector<ll>(n+1, 1e18));
for(int i=0; i<n; i++) {
for(int j=0; j<n; j++) {
if(d[i] == d[j]) {
continue;
}
if(d[i] == 'S') {
if(d[j] == 'N') {
if(x[i] == x[j] and y[i] < y[j]) {
sudar[i][j] = (y[j]-y[i]) / 2;
}
} else if(d[j] == 'E') {
if(x[i] + y[i] == x[j] + y[j] and y[i] < y[j]) {
sudar[i][j] = y[j] - y[i];
}
} else if(d[j] == 'W') {
if(x[i] - y[i] == x[j] - y[j] and y[i] < y[j]) {
sudar[i][j] = y[j] - y[i];
}
}
}
else if(d[i] == 'N') {
if(d[j] == 'E') {
if(x[i] - y[i] == x[j] - y[j] and y[i] > y[j]) {
sudar[i][j] = y[i] - y[j];
}
} else if(d[j] == 'W') {
if(x[i] + y[i] == x[j] + y[j] and y[i] > y[j]) {
sudar[i][j] = y[i] - y[j];
}
}
}
else if(d[i] == 'E') {
if(d[j] == 'W') {
if(y[i] == y[j] and x[i] < x[j]) {
sudar[i][j] = (x[j]-x[i]) / 2;
}
}
}
}
}
vector<pair<ll,pair<int,int>>>v;
for(int i=0; i<n; i++) {
for(int j=0; j<n; j++) {
if(sudar[i][j] != 1e18) {
v.push_back({sudar[i][j], {i,j}});
}
}
}
sort(v.begin(), v.end());
vector<int>blown(n+1,0);
for(auto x : v) {
//cout << x.first << " " << x.second.first << " " << x.second.second << endl;
if(blown[x.second.first] > 0 and blown[x.second.first] != x.first or blown[x.second.second] > 0 and blown[x.second.second] != x.first) continue;
blown[x.second.first] = x.first;
blown[x.second.second] = x.first;
}
for(int i=0; i<n; i++) {
if(!blown[i]) cout << i+1 << endl;
}
} else {
map<ll,int> m;
for(int i=0; i<n; i++) {
if(d[i] == 'S') {
if(!m[x[i]+y[i]]) m[x[i]+y[i]] = i+1;
}
}
vector<pair<pair<int, char>,pair<int,int>>>v[n+1];
for(int i=0; i<n; i++) {
if(m[x[i]+y[i]]) {
v[m[x[i]+y[i]]].push_back({{i, d[i]}, {x[i],y[i]}});
}
}
vector<int>blown(n+1,0);
for(int i=1; i<=n; i++) {
if(v[i].size()) {
sort(v[i].begin(), v[i].end());
queue<int> east, south;
for(int j=0; j<v[i].size(); j++) {
if(v[i][j].first.second == 'S') south.push(v[i][j].first.first);
else east.push(v[i][j].first.first);
}
while(!east.empty() and !south.empty()) {
int E = east.front(), S = south.front();
blown[E] = 1;
blown[S] = 1;
east.pop();
south.pop();
}
}
}
for(int i=0; i<n; i++) {
if(!blown[i]) cout << i+1 << endl;
}
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
//freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
int tc=1;
while(tc--)
solve();
}
