#include <bits/stdc++.h>
using namespace std;
using lint = long long;
constexpr lint mod = 1e9 + 7;
#define all(x) (x).begin(), (x).end()
#define bitcount(n) __builtin_popcountl((lint)(n))
#define fcout cout << fixed << setprecision(15)
#define highest(x) (63 - __builtin_clzl(x))
#define rep(i, n) for(int i = 0; i < int(n); i++)
#define rep2(i, l, r) for(int i = int(l); i < int(r); i++)
#define repr(i, n) for(int i = int(n) - 1; i >= 0; i--)
#define repr2(i, l, r) for(int i = int(r) - 1; i >= int(l); i--)
#define SZ(x) int(x.size())
constexpr int inf9 = 1e9; constexpr lint inf18 = 1e18;
inline void YES(bool condition){ if(condition) cout << "YES" << endl; else cout << "NO" << endl; }
inline void Yes(bool condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
inline void assertNO(bool condition){ if(!condition){ cout << "NO" << endl; exit(0); } }
inline void assertNo(bool condition){ if(!condition){ cout << "No" << endl; exit(0); } }
inline void assertm1(bool condition){ if(!condition){ cout << -1 << endl; exit(0); } }
lint power(lint base, lint exponent, lint module){ if(exponent % 2){ return power(base, exponent - 1, module) * base % module; }else if(exponent){ lint root_ans = power(base, exponent / 2, module); return root_ans * root_ans % module; }else{ return 1; }}
struct position{ int y, x; }; position mv[4] = {{0, -1}, {1, 0}, {0, 1}, {-1, 0}}; double euclidean(position first, position second){ return sqrt((second.x - first.x) * (second.x - first.x) + (second.y - first.y) * (second.y - first.y)); }
template<class T, class U> string to_string(pair<T, U> x){ return to_string(x.first) + "," + to_string(x.second); } string to_string(string x){ return x; }
template<class T> string to_string(complex<T> x){ return to_string(make_pair(x.real(), x.imag())); }
template<class itr> void array_output(itr start, itr goal){ string ans; for(auto i = start; i != goal; i++) cout << (i == start ? "" : " ") << (*i); if(!ans.empty()) ans.pop_back(); cout << ans << endl; }
template<class itr> void cins(itr first, itr last){ for(auto i = first; i != last; i++){ cin >> (*i); } }
template<class T> T gcd(T a, T b){ if(b) return gcd(b, a % b); else return a; }
template<class T> T lcm(T a, T b){ return a / gcd(a, b) * b; }
struct combination{ vector<lint> fact, inv; combination(int sz) : fact(sz + 1), inv(sz + 1){ fact[0] = 1; for(int i = 1; i <= sz; i++){ fact[i] = fact[i - 1] * i % mod; } inv[sz] = power(fact[sz], mod - 2, mod); for(int i = sz - 1; i >= 0; i--){ inv[i] = inv[i + 1] * (i + 1) % mod; } } lint P(int n, int r){ if(r < 0 || n < r) return 0; return (fact[n] * inv[n - r] % mod); } lint C(int p, int q){ if(q < 0 || p < q) return 0; return (fact[p] * inv[q] % mod * inv[p - q] % mod); } };
template<class itr> bool next_sequence(itr first, itr last, int max_bound){ itr now = last; while(now != first){ now--; (*now)++; if((*now) == max_bound){ (*now) = 0; }else{ return true; } } return false; }
template<class itr, class itr2> bool next_sequence2(itr first, itr last, itr2 first2, itr2 last2){ itr now = last; itr2 now2 = last2; while(now != first){ now--, now2--; (*now)++; if((*now) == (*now2)){ (*now) = 0; }else{ return true; } } return false; }
template<class T> bool chmax(T &a, const T &b){ if(a < b){ a = b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b){ if(b < a){ a = b; return 1; } return 0; }
inline int at(lint i, int j){ return (i >> j) & 1; }
random_device rnd;
bool is_in_board(lint y, lint x, lint H, lint W){ return (0 <= y && y < H && 0 <= x && x < W); }

lint check_0(vector<position> points, string move){ // 左右の衝突を判定
    map<int, vector<pair<int, char>>> y_coord;
    rep(i, points.size()){
        y_coord[points[i].y].push_back({points[i].x, move[i]});
    }
    lint ans = inf9;
    for(auto i: y_coord){
        auto sorted_x = i.second;
        sort(all(sorted_x));
        lint last_R = -inf9;
        for(auto j: sorted_x){
            if(j.second == 'R'){
                last_R = j.first;
            }
            if(j.second == 'L'){
                ans = min(ans, (j.first - last_R) * 5);
            }
        }
    }
    return ans;
}

lint check_45(vector<position> points, string move){ // 左上と右下の衝突を判定
    map<int, vector<pair<int, char>>> x_plus_y;
    rep(i, points.size()){
        x_plus_y[points[i].x + points[i].y].push_back({points[i].x, move[i]});
    }
    lint ans = inf9;
    for(auto i: x_plus_y){
        auto sorted_x = i.second;
        sort(all(sorted_x));
        lint last_R = -inf9, last_D = -inf9;
        for(auto j: sorted_x){
            if(j.second == 'R'){
                last_R = j.first;
            }
            if(j.second == 'D'){
                last_D = j.first;
            }
            if(j.second == 'U'){
                ans = min(ans, (j.first - last_R) * 10);
            }
            if(j.second == 'L'){
                ans = min(ans, (j.first - last_D) * 10);
            }
        }
    }
    return ans;
}

int main(){
    int N;
    cin >> N;
    vector<position> points(N);
    string move;
    move.resize(N);
    rep(i, N){
        cin >> points[i].x >> points[i].y >> move[i];
    }
    lint ans = inf9;
    rep(c, 2){
        ans = min({ans, check_0(points, move), check_45(points, move)});
        //cout << check_0(points, move) << endl;
        //cout << check_45(points, move) << endl;
        // 90度回転
        for(position &i: points){
            int y = i.y, x = i.x;
            i.x = -y;
            i.y = x;
        }
        for(char &i: move){
            if(i == 'U'){
                i = 'L';
            }else if(i == 'L'){
                i = 'D';
            }else if(i == 'D'){
                i = 'R';
            }else if(i == 'R'){
                i = 'U';
            }
        }
    }
    if(ans == inf9){
        cout << "SAFE" << endl;
    }else{
        cout << ans << endl;
    }
}




Measured memory_bytes: 30096