#include "bits/stdc++.h"
using namespace std;
//~ #define int ll
typedef long long ll;
#define ar array
template<class T> bool umin(T& a, T b) { if(b < a) { a = b; return true; } return false; }
template<class T> bool umax(T& a, T b) { if(a < b) { a = b; return true; } return false; }
//~ const int mod = 1e9 + 7;
//~ void add(int& a, const int b){
//~ a += b;
//~ while(a >= mod) a -= mod;
//~ while(a < 0) a += mod;
//~ }
const int inf = 1e9 + 5;
void solve(){
int n; cin >> n;
vector<int> x(n), y(n), d(n);
vector<ar<int, 2>> coll[3] = {
{ {0, 3}, {1, 2} },
{ {2, 3}, {1, 0} },
{ {1, 3}, {2, 0} }
};
for(int i=0;i<n;i++){
char c;
cin >> x[i] >> y[i] >> c;
if(c == 'N') d[i] = 0;
if(c == 'E') d[i] = 1;
if(c == 'S') d[i] = 2;
if(c == 'W') d[i] = 3;
}
auto check = [&](int i, int j){
if(x[i] > x[j]) swap(i, j);
if(x[i] == x[j] && y[i] > y[j]) swap(i, j);
ar<int, 2> d_ = {d[i], d[j]};
if(x[i] + y[i] == x[j] + y[j] && (d_ == coll[0][0] || d_ == coll[0][1])){
return abs(x[i] - x[j]);
}
if(x[i] - y[i] == x[j] - y[j] && (d_ == coll[1][0] || d_ == coll[1][1])) {
return abs(x[i] - x[j]);
}
if(d_ == coll[2][0] && y[i] == y[j]) return (x[j] - x[i]) / 2;
if(d_ == coll[2][1] && x[i] == x[j]) return (y[j] - y[i]) / 2;
return inf + 1;
};
if(n <= 5000){
vector<vector<int>> t(n, vector<int>(n, inf));
vector<ar<int, 3>> colt;
for(int i=0;i<n;i++){
for(int j=i+1;j<n;j++){
t[i][j] = check(i, j);
if(t[i][j] <= inf) colt.push_back({t[i][j], i, j});
}
}
sort(colt.begin(), colt.end());
vector<int> liv(n, 1);
for(int i=0;i<(int)colt.size();){
int j = i;
while(j < (int)colt.size() && colt[j][0] == colt[i][0]) j++;
vector<int> dead;
for(int k=i;k<j;k++){
auto [time_, x, y] = colt[k];
if(liv[x] && liv[y]){
dead.push_back(x);
dead.push_back(y);
}
}
for(auto x : dead){
liv[x] = 0;
}
i = j;
}
for(int i=0;i<n;i++){
if(liv[i]) cout<<i + 1<<"\n";
}
} else {
map<int, vector<int>> diag;
for(int i=0;i<n;i++){
diag[x[i] - y[i]].push_back(i);
}
vector<int> ans;
for(auto [dg, v] : diag){
sort(v.begin(), v.end(), [&](int i, int j){
return x[i] < x[j];
});
vector<int> ss;
for(auto i : v){
if(d[i] == 1) ss.push_back(i);
else {
if(!ss.empty()) ss.pop_back();
else ans.push_back(i);
}
}
ans.insert(ans.end(), ss.begin(), ss.end());
}
for(auto x : ans) cout<<++x<<"\n";
//~ cout<<"\n";
}
}
signed main(){
ios_base::sync_with_stdio(0); cin.tie(0);
int t = 1;
//~ cin >> t;
while(t--){
solve();
}
}
