#include <bits/stdc++.h>
using namespace std;
#define x first
#define y second
int main(){
int N;
cin>> N;
vector<pair<pair<int,int>, char>> sh(N);
for (int i = 0; i< N; ++i){
cin>> sh[i].x.x >> sh[i].x.y >> sh[i].y;
}
vector<pair<int,int>>dir(20);
dir[0] = make_pair(1, 0);
dir['N' -'E'] = make_pair(0, -1);
dir['S'- 'E'] = make_pair(0, 1);
dir['W' - 'E'] = make_pair(-1, 0);
priority_queue<pair<int, pair<int,int>>> choque;
for (int i = 0; i< N; ++i){
for (int j = i+1; j < N; ++j){
if (sh[i].y == sh[j].y) continue;
if (dir[sh[i].y - 'E'].x == 0 and dir[sh[j].y - 'E'].x == 0){
if (sh[i].x.x == sh[j].x.x){
int mov = abs(sh[i].x.y - sh[j].x.y)/2;
choque.push({-mov, {i, j}});
}
}
else if (dir[sh[i].y - 'E'].y == 0 and dir[sh[j].y - 'E'].y == 0){
if (sh[i].x.y == sh[j].x.y){
int mov = abs(sh[i].x.x - sh[j].x.x)/2;
choque.push({-mov, {i, j}});
}
}
else{
int n1 = (sh[j].x.x - sh[i].x.x)/(dir[sh[i].y-'E'].x - dir[sh[j].y -'E'].x);
int n2 = (sh[j].x.y - sh[i].x.y)/(dir[sh[i].y-'E'].y - dir[sh[j].y -'E'].y);
if (n1 == n2 and n1 > 0) choque.push({-n1, {i,j}});
}
}
}
vector<int>used(N, 0);
while (!choque.empty()){
pair<int, pair<int,int>> act= choque.top();
choque.pop();
if (used[act.y.x] or used[act.y.y]){
if (used[act.y.x] == -act.x) used[act.y.y] = -act.x;
if (used[act.y.y] == -act.x) used[act.y.x] = -act.x;
}
else{
used[act.y.x] = -act.x;
used[act.y.y] = -act.x;
}
}
for (int i = 0; i< N; ++i){
if (!used[i]) cout<< i+1 << '\n';
}
return 0;
}
