#include <bits/stdc++.h>
#define div /
#define ll long long
#define fore(i, l, r) for(int i=int(l); i<int(r); i++)
#define sz(a) int((a).size())
using namespace std;
const int INF = 1e9;
const int MX = 5e5 + 23;
const int MOD = 1000000007;
const int MAX_N = 5e5+23;
const int N = 1e6;
int sudar(int x1, int y1, char d1, int x2, int y2, char d2) {
if(d1 == d2)
return 0;
if(d1 == 'E' and d2 == 'N' or d1 == 'S' and d2 == 'N' or d1 == 'S' and d2 == 'E' or d1 == 'W') {
swap(d1,d2);
swap(x1,x2);
swap(y1,y2);
}
if(d1 == 'N') {
if(d2 == 'S') {
if((x1 != x2) or (y1 < y2)) return 0;
return (y1-y2)/2;
} else if(d2 == 'E') {
if((y2 > y1) or (x2 > x1) or ((y1-y2) != (x1-x2))) return 0;
return abs(x1-x2);
} else if(d2 == 'W') {
if((y2 > y1) or (x2 < x1) or ((y1-y2) != (x2-x1))) return 0;
return abs(x2-x1);
}
} else if(d1 == 'E') {
if(d2 == 'W') {
if((y1 != y2) or (x1 > x2)) return 0;
return (x2-x1)/2;
} else if(d2 == 'S') {
if((y2 > y1) or (x2 < x1) or ((y1-y2) != (x2-x1))) return 0;
return abs(x2-x1);
}
} else if(d1 == 'S') {
if(d2 == 'W') {
if((y1 > y2) or (x1 > x2) or ((y2-y1) != (x2-x1))) return 0;
return abs(x2-x1);
}
}
}
void solve() {
int n; cin >> n;
int x[n], y[n];
char d[n];
fore(i,0,n)
cin >> x[i] >> y[i] >> d[i];
priority_queue<pair<int,pair<int,int>>>pq;
fore(i,0,n) {
fore(j,0,n) {
if(sudar(x[i],y[i],d[i],x[j],y[j],d[j]))
pq.push({sudar(x[i],y[i],d[i],x[j],y[j],d[j]),{i,j}});
}
}
int destroyed[n+5];
memset(destroyed,0,sizeof destroyed);
while(!pq.empty()) {
pair<int,pair<int,int>> explosion = pq.top();
pq.pop();
if(destroyed[explosion.second.first] == 0 and destroyed[explosion.second.second] == 0) {
destroyed[explosion.second.first] = explosion.first;
destroyed[explosion.second.second] = explosion.first;
} else if(destroyed[explosion.second.first] == explosion.first and destroyed[explosion.second.second] == 0) {
destroyed[explosion.second.second] = explosion.first;
} else if(destroyed[explosion.second.first] == 0 and destroyed[explosion.second.second] == explosion.first) {
destroyed[explosion.second.first] = explosion.first;
}
}
fore(i,0,n)
if(!destroyed[i])
cout << i+1 << endl;
}
int main() {
ios::sync_with_stdio(false);
int t=1;
while(t--) solve();
}
