// 人外有人，天外有天
// author: Ausp3x
#pragma GCC optimize("O1, O2, O3, Ofast, unroll-loops")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
#define fi first
#define se second
#define pb push_back
// #define DEBUG
typedef long long lng;
typedef __int128 lli;
template<class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
int const INF32 = 0x3f3f3f3f;
lng const INF64 = 0x3f3f3f3f3f3f3f3f;
map<char, pair<int, int>> d_to_move = {
{'N', {0, -1}},
{'S', {0, 1}},
{'E', {1, 0}},
{'W', {-1, 0}}
};
lng getCollisionTime(tuple<int, int, char> &ship1, tuple<int, int, char> &ship2) {
auto [x1, y1, d1] = ship1;
auto [x2, y2, d2] = ship2;
if (d1 == d2)
return INF64;
if (d1 == 'N') {
if (d2 == 'S') {
if (x1 == x2 && y1 >= y2 && abs(y1 - y2) % 2 == 0)
return abs(y1 - y2) / 2;
else
return INF64;
} else if (d2 == 'E') {
if (x1 >= x2 && y1 >= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'W') {
if (x1 <= x2 && y1 >= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
}
} else if (d1 == 'S') {
if (d2 == 'N') {
if (x1 == x2 && y1 <= y2 && abs(y1 - y2) % 2 == 0)
return abs(y1 - y2) / 2;
else
return INF64;
} else if (d2 == 'E') {
if (x1 >= x2 && y1 <= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'W') {
if (x1 <= x2 && y1 <= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
}
} else if (d1 == 'E') {
if (d2 == 'N') {
if (x1 <= x2 && y1 <= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'S') {
if (x1 <= x2 && y1 >= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'W') {
if (x1 <= x2 && y1 == y2 && abs(x1 - x2) % 2 == 0)
return abs(x1 - x2) / 2;
else
return INF64;
}
} else if (d1 == 'W') {
if (d2 == 'N') {
if (x1 >= x2 && y1 <= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'S') {
if (x1 >= x2 && y1 >= y2 && abs(x1 - x2) == abs(y1 - y2))
return abs(x1 - x2);
else
return INF64;
} else if (d2 == 'E') {
if (x1 >= x2 && y1 == y2 && abs(x1 - x2) % 2 == 0)
return abs(x1 - x2) / 2;
else
return INF64;
}
}
return -1;
}
void solve() {
int n;
cin >> n;
bool st6_chk = true;
vector<tuple<int, int, char>> ships(n + 1);
for (int i = 1; i <= n; i++) {
cin >> get<0>(ships[i]) >> get<1>(ships[i]) >> get<2>(ships[i]);
st6_chk &= (get<2>(ships[i]) == 'S' || get<2>(ships[i]) == 'E');
}
if (n <= 5000) {
priority_queue<tuple<lng, int, int>, vector<tuple<lng, int, int>>, greater<tuple<lng, int, int>>> pq;
for (int i = 1; i <= n; i++)
for (int j = i + 1; j <= n; j++) {
lng t = getCollisionTime(ships[i], ships[j]);
assert(t != -1);
if (t == INF64)
continue;
// cout << t << ' ' << i << ' ' << j << endl;
pq.push({t, i, j});
}
vector<int> death_time(n + 1, -1);
while (!pq.empty()) {
auto [t, i, j] = pq.top();
pq.pop();
if ((death_time[i] != -1 && death_time[i] != t) || (death_time[j] != -1 && death_time[j] != t))
continue;
death_time[i] = t;
death_time[j] = t;
}
// for (int x : death_time)
// cout << x << ' ';
// cout << endl;
#ifdef DEBUG
cout << "ans: ";
#endif
for (int i = 1; i <= n; i++)
if (death_time[i] == -1)
cout << i << ' ';
cout << endl;
#ifndef DEBUG
return;
#endif
}
if (st6_chk) {
map<lng, ordered_set<tuple<int, int, int>>> E_grps, S_grps;
for (int i = 1; i <= n; i++) {
auto [x, y, d] = ships[i];
assert(d == 'E' || d == 'S');
if (d == 'E') {
E_grps[x + y].insert({x, y, i});
} else if (d == 'S') {
S_grps[x + y].insert({x, y, i});
}
}
vector<bool> is_alive(n + 1, true);
for (auto &[k, v] : E_grps) {
for (auto itr = v.rbegin(); itr != v.rend(); itr++) {
auto [x_i, y_i, i] = *itr;
int idx = S_grps[k].order_of_key({x_i, -INF32, -INF32});
if (idx == S_grps[k].size())
continue;
auto [x_j, y_j, j] = *S_grps[k].find_by_order(idx);
is_alive[i] = false;
is_alive[j] = false;
S_grps[k].erase({x_j, y_j, j});
}
}
#ifdef DEBUG
cout << "st6 ans: ";
#endif
for (int i = 1; i <= n; i++)
if (is_alive[i])
cout << i << ' ';
cout << endl;
return;
}
return;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int t = 1;
// cin >> t;
while (t--) {
solve();
}
return 0;
}
