#include <cassert>
#include <cstdio>
#include <cmath>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <queue>
#include <numeric>
#include <algorithm>

using namespace std;
using lint = long long;
constexpr int MOD = 1000000007, INF = 1010101010;
constexpr lint LINF = 1LL << 60;

#ifdef _DEBUG
#include "../../library/library/debug_template.cpp"
#define DMP(...) dump(#__VA_ARGS__, __VA_ARGS__)
#else 
#define DMP(...) ((void)0)
#endif

struct init {
	init() {
		cin.tie(nullptr); ios::sync_with_stdio(false);
		cout << fixed << setprecision(10);
	}
} init_;

template<class T = lint, class R = lint>
struct Point2D {
	T x, y;
	constexpr Point2D(T x = 0, T y = 0) noexcept : x(x), y(y) {};
	constexpr Point2D(pair<T, T> p) noexcept : x(p.first), y(p.second) {};
	constexpr bool operator==(const Point2D& rhs) const noexcept { return x == rhs.x && y == rhs.y; }
	constexpr bool operator!=(const Point2D& rhs) const noexcept { return !((*this) == rhs); }
	constexpr bool operator< (const Point2D& rhs) const noexcept { return x < rhs.x || (x == rhs.x && y < rhs.y); }
	constexpr bool operator> (const Point2D& rhs) const noexcept { return rhs < (*this); }
	constexpr bool operator<=(const Point2D& rhs) const noexcept { return !((*this) > rhs); }
	constexpr bool operator>=(const Point2D& rhs) const noexcept { return !((*this) < rhs); }
	constexpr Point2D  operator+ (const Point2D& rhs) const noexcept { return { x + rhs.x, y + rhs.y }; }
	constexpr Point2D  operator- (const Point2D& rhs) const noexcept { return { x - rhs.x, y - rhs.y }; }
	constexpr Point2D  operator* (const T& lmap) const noexcept { return { lmap * x, lmap * y }; }
	constexpr Point2D  operator/ (const T& lmap) const noexcept { return { x / lmap, y / lmap }; }
	constexpr Point2D& operator+=(const Point2D& rhs) noexcept { return ((*this) = (*this) + rhs); }
	constexpr Point2D& operator-=(const Point2D& rhs) noexcept { return ((*this) = (*this) - rhs); }
	constexpr Point2D& operator*=(const T& lmap) noexcept { return ((*this) = (*this) * lmap); }
	constexpr Point2D& operator/=(const T& lmap) noexcept { return ((*this) = (*this) / lmap); }
	constexpr Point2D  operator- () const noexcept { return { -x, -y }; }
	constexpr T operator* (const Point2D& rhs) const noexcept { return x * rhs.x + y * rhs.y; }
	constexpr Point2D nor() const noexcept { return { y, -x }; }
	constexpr long double hypot() const noexcept { return ::hypotl(x, y); }
	friend istream& operator>>(istream& is, Point2D& p) { return is >> p.x >> p.y; }
	friend ostream& operator<<(ostream& os, const Point2D& p) { return os << p.x << " " << p.y << "\n"; }
	R& operator[](vector<vector<R>>& v) { return v[x][y]; }
};

using pnt = Point2D<>;

template<class T>
inline bool chmin(T& a, const T b) { return a > b && (a = b, true); }

int main() {

	int N;
	cin >> N;

	unordered_map<char, vector<pnt>> XY;
	for (int it = 0; it < N; it++) {
		pnt xy;
		char d;
		cin >> xy >> d;
		XY[d].emplace_back(xy);
	}

	lint ans = LINF;
	auto update = [&ans](auto &l, auto &r, pnt grad, int speed) {

		sort(l.begin(), l.end(), [](auto p, auto q) { return p.x < q.x; });
		sort(r.begin(), r.end(), [](auto p, auto q) { return p.x < q.x; });

		map<lint, vector<lint>> lmap, rmap;
		for (const auto& xy : l) lmap[xy * grad].emplace_back(xy.x);
		for (const auto& xy : r) rmap[xy * grad].emplace_back(xy.x);

		for (const auto& [key, vecl] : lmap) {
			// 同じ切片の点が存在するかを確認する
			auto it_rmap = rmap.find(key);
			if (it_rmap != rmap.end()) {
				// l,rでl<rとなるように尺取りしていく
				const auto it_end = it_rmap->second.end();
				auto it = it_rmap->second.begin();
				for (const auto& xl : vecl) {
					while (it != it_end && *it < xl) it++;
					if (it == it_end) break;
					chmin(ans, (*it - xl) * speed);
				}
			}
		}
	};

	update(XY['R'], XY['U'], pnt(1,  1), 10);
	update(XY['D'], XY['L'], pnt(1,  1), 10);
	update(XY['R'], XY['D'], pnt(1, -1), 10);
	update(XY['U'], XY['L'], pnt(1, -1), 10);
	update(XY['R'], XY['L'], pnt(0,  1),  5);
	for (auto& xy : XY['U']) swap(xy.x, xy.y);
	for (auto& xy : XY['D']) swap(xy.x, xy.y);
	update(XY['U'], XY['D'], pnt(0,  1),  5);

	if (ans == LINF) cout << "SAFE" << "\n";
	else cout << ans << "\n";

	return 0;
}



Measured memory_bytes: 28000