#include <bits/stdc++.h>
using namespace std;
#define LOCAL
#pragma region Macros
typedef long long ll;
#define ALL(x) (x).begin(),(x).end()
const long long MOD=1e9+7;
// const long long MOD=998244353;
const int INF=1e9;
const long long IINF=1e18;
const int dx[4]={1,0,-1,0},dy[4]={0,1,0,-1};
const char dir[4]={'D','R','U','L'};

template<typename T>
istream &operator>>(istream &is,vector<T> &v){
    for (T &x:v) is >> x;
    return is;
}
template<typename T>
ostream &operator<<(ostream &os,const vector<T> &v){
    for (int i=0;i<v.size();++i){
        os << v[i] << (i+1==v.size()?"": " ");
    }
    return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const pair<T,U> &p){
    cout << '(' << p.first << ',' << p.second << ')';
    return os;
}
template<typename T,typename U>
ostream &operator<<(ostream &os,const map<T,U> &m){
    os << '{';
    for (auto itr=m.begin();itr!=m.end();++itr){
        os << '(' << itr->first << ',' << itr->second << ')';
        if (++itr!=m.end()) os << ',';
        --itr;
    }
    os << '}';
    return os;
}
template<typename T>
ostream &operator<<(ostream &os,const set<T> &s){
    os << '{';
    for (auto itr=s.begin();itr!=s.end();++itr){
        os << *itr;
        if (++itr!=s.end()) os << ',';
        --itr;
    }
    os << '}';
    return os;
}

void debug_out(){cerr << '\n';}
template<class Head,class... Tail>
void debug_out(Head&& head,Tail&&... tail){
    cerr << head;
    if (sizeof...(Tail)>0) cerr << ", ";
    debug_out(move(tail)...);
}
#ifdef LOCAL
#define debug(...) cerr << " ";\
cerr << #__VA_ARGS__ << " :[" << __LINE__ << ":" << __FUNCTION__ << "]" << '\n';\
cerr << " ";\
debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

template<typename T> T gcd(T x,T y){return y!=0?gcd(y,x%y):x;}
template<typename T> T lcm(T x,T y){return x/gcd(x,y)*y;}

template<class T1,class T2> inline bool chmin(T1 &a,T2 b){
    if (a>b){a=b; return true;} return false;
}
template<class T1,class T2> inline bool chmax(T1 &a,T2 b){
    if (a<b){a=b; return true;} return false;
}
#pragma endregion

const int MAX_X=2e5+10;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N; cin >> N;
    string URDL="URDL";
    vector<vector<pair<int,int>>> pos(4);
    for (int i=0;i<N;++i){
        int X,Y; char U; cin >> X >> Y >> U;
        for (int j=0;j<4;++j){
            if (U==URDL[j]){
                if (j&1) pos[j].emplace_back(X,Y);
                else pos[j].emplace_back(Y,X);
            }
        }
    }
    for (int i=0;i<4;++i) sort(ALL(pos[i]));
    int ans=INF;
    map<int,vector<int>> uy,dy,rx,lx;
    for (auto p:pos[0]) uy[p.second].emplace_back(p.first);
    for (auto p:pos[1]) rx[p.second].emplace_back(p.first);
    for (auto p:pos[2]) dy[p.second].emplace_back(p.first);
    for (auto p:pos[3]) lx[p.second].emplace_back(p.first);
    /*
    for (int i=0;i<N;++i){
        if (U[i]=='U') uy[X[i]].emplace(Y[i]);
        if (U[i]=='R') rx[Y[i]].emplace(X[i]);
        if (U[i]=='D') dy[X[i]].emplace(Y[i]);
        if (U[i]=='L') lx[Y[i]].emplace(X[i]);
    }
    */
    for (auto p:uy){
        if (!dy.count(p.first)) continue;
        auto &v=dy[p.first];
        /*
        for (int y:p.second){
            auto itr=lower_bound(ALL(v),y);
            if (itr==v.end()) continue;
            chmin(ans,*itr-y);
        }
        */
        int s=v.size(),now=0;
        for (int y:p.second){
            while(now<s&&v[now]<y) ++now;
            if (now==s) break;
            chmin(ans,v[now]-y);
        }
    }
    for (auto p:rx){
        if (!lx.count(p.first)) continue;
        auto &v=lx[p.first];
        /*
        for (int y:p.second){
            auto itr=lower_bound(ALL(v),y);
            if (itr==v.end()) continue;
            chmin(ans,*itr-y);
        }
        */
        int s=v.size(),now=0;
        for (int y:p.second){
            while(now<s&&v[now]<y) ++now;
            if (now==s) break;
            chmin(ans,v[now]-y);
        }
    }
    for (int i=0;i<pos[0].size();++i){
        swap(pos[0][i].first,pos[0][i].second);
    }
    for (int i=0;i<pos[2].size();++i){
        swap(pos[2][i].first,pos[2][i].second);
    }
    sort(ALL(pos[0]));
    sort(ALL(pos[2]));
    vector<vector<map<int,vector<int>>>> naname(2,vector<map<int,vector<int>>>(4));
    for (int j=0;j<4;++j){
        for (auto p:pos[j]){
            int X=p.first,Y=p.second;
            naname[0][j][X+Y].emplace_back(X);
            naname[1][j][X-Y].emplace_back(X);
        }
    }
    /*
    for (int i=0;i<N;++i){
        for (int j=0;j<4;++j){
            if (U[i]==URDL[j]){
                naname[0][j][X[i]+Y[i]].emplace(X[i]);
                naname[1][j][X[i]-Y[i]].emplace(X[i]);
            }
        }
    }
    */
    for (int i=0;i<2;++i){
        for (int j=0;j<=2;j+=2){
            for (auto p:naname[i][j]){
                if (naname[i][1].count(p.first)){
                    auto &v=naname[i][1][p.first];
                    int s=v.size(),now=-1;
                    for (int x:p.second){
                        if (i==0&&j==0){
                            /*
                            auto itr=upper_bound(ALL(v),x);
                            if (itr==v.begin()) continue;
                            chmin(ans,2*(x-*(--itr)));
                            */
                            while(now+1<s&&v[now+1]<=x) ++now;
                            if (now<0) continue;
                            chmin(ans,2*(x-v[now]));
                        }
                        if (i==1&&j==2){
                            /*
                            auto itr=upper_bound(ALL(v),x);
                            if (itr==v.begin()) continue;
                            chmin(ans,2*(x-*(--itr)));
                            */
                            while(now+1<s&&v[now+1]<=x) ++now;
                            if (now<0) continue;
                            chmin(ans,2*(x-v[now]));
                        }
                    }
                }
                if (naname[i][3].count(p.first)){
                    auto &v=naname[i][3][p.first];
                    int s=v.size(),now=0;
                    for (int x:p.second){
                        if (i==0&&j==2){
                            /*
                            auto itr=lower_bound(ALL(v),x);
                            if (itr==v.end()) continue;
                            chmin(ans,2*(*itr-x));
                            */
                            while(now<s&&v[now]<x) ++now;
                            if (now==s) break;
                            chmin(ans,2*(v[now]-x));
                        }
                        if (i==1&&j==0){
                            /*
                            auto itr=lower_bound(ALL(v),x);
                            if (itr==v.end()) continue;
                            chmin(ans,2*(*itr-x));
                            */
                            while(now<s&&v[now]<x) ++now;
                            if (now==s) break;
                            chmin(ans,2*(v[now]-x));
                        }
                    }
                }
            }
        }
    }
    if (ans==INF) cout << "SAFE" << '\n';
    else cout << ans*5 << '\n';
}

Measured memory_bytes: 70208