#include <bits/stdc++.h>
//#include <boost/multiprecision/cpp_int.hpp>
using namespace std;

using dou =long double;
string yes="yes";
string Yes="Yes";
string YES="YES";
string no="no";
string No="No";
string NO="NO";

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
typedef long long ll;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;
const ll mod = 1000000007ll;
//const ll mod = 1000003;
struct mint {
  ll x; // typedef long long ll;
  mint(ll x=0):x((x%mod+mod)%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) { (x *= a.x) %= mod; return *this;}
  mint operator+(const mint a) const { return mint(*this) += a;}
  mint operator-(const mint a) const { return mint(*this) -= a;}
  mint operator*(const mint a) const { return mint(*this) *= a;}
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }

  // for prime mod
  mint inv() const { return pow(mod-2);}
  mint& operator/=(const mint a) { return *this *= a.inv();}
  mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, const mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}




#define rep(i, n)         for(ll i = 0; i < (ll)(n); i++)
#define brep(n)           for(int bit=0;bit<(1<<n);bit++)
#define bbrep(n)           for(int bbit=0;bbit<(1<<n);bbit++)
#define erep(i,container) for (auto &i : container)
#define itrep(i,container) for (auto i : container)
#define irep(i, n)        for(ll i = n-1; i >= (ll)0ll; i--)
#define rrep(i,m,n) for(ll i = m; i < (ll)(n); i++)
#define reprep(i,j,h,w) rep(i,h)rep(j,w)
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define VEC(type,name,n) std::vector<type> name(n);rep(i,n)std::cin >> name[i];
#define pb push_back
#define pf push_front
#define query int qq;std::cin >> qq;rep(qqq,qq)
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define itn int
#define mp make_pair
#define sum(a) accumulate(all(a),0ll)
#define keta fixed<<setprecision
#define vout(a) erep(qxqxqx,a)std::cout << qxqxqx << ' ';std::cout  << std::endl;
#define vvector(name,typ,m,n,a)vector<vector<typ> > name(m,vector<typ> (n,a))
//#define vvector(name,typ,m,n)vector<vector<typ> > name(m,vector<typ> (n))
#define vvvector(name,t,l,m,n,a) vector<vector<vector<t> > > name(l, vector<vector<t> >(m, vector<t>(n,a)));
#define vvvvector(name,t,k,l,m,n,a) vector<vector<vector<vector<t> > > > name(k,vector<vector<vector<t> > >(l, vector<vector<t> >(m, vector<t>(n,a)) ));
#define case std::cout <<"Case #" <<qqq+1<<": "
#define res resize
#define as assign
#define ffor for(;;)
#define ppri(a,b) std::cout << a<<" "<<b << std::endl
#define pppri(a,b,c) std::cout << a<<" "<<b <<" "<< c<<std::endl
#define aall(x,n) (x).begin(),(x).begin()+(n)
#define ssum(a) accumulate(a,0ll) 
#define stirng string
//#define grid_input(a,type) int h,w;std::cin >> h>>w;vvector(a,type,h,w,0);reprep(i,j,h,w)std::cin >> a[i][j];

//typedef long long T;
ll ceil(ll a,ll b){
    return ((a+b-1)/b);
}
const int INF = 2000000000;
//const ll INF64 =3223372036854775807ll;
//const ll INF64 = 9223372036854775807ll;
const ll INF64 = 9223372036854775ll;
const ll MOD = 1000000007ll;
//const ll MOD = 1000003ll;
const ll OD = 1000000000000007ll;
const dou pi=3.141592653589793;
long long modpow(long long a, long long n) { //累乗の余剰
    long long res = 1;
    while (n > 0) {
        if (n & 1) res = res * a % MOD;
        a = a * a % MOD;
        n >>= 1;
    }
    return res;
    
}

//メモ
//tuple<hoge,huga,foo> tのget関数はget<i>(t)
//resizeはメンバ関数
//三項演算子を覚えよう
// a?b:cと書くと aならばbの処理をする
//i本目にbitをたてる　-> (1<<i)
int main(){
    int n;
    std::cin >> n;
    vector<int>x(n),y(n);
    std::vector<char> dir(n);
    std::vector<set<int>> u(200050),r(200050),d(200050),l(200050);
    int du=200001;
    rep(i,n){
        std::cin >> x[i]>>y[i]>>dir[i];
        if(dir[i]=='U'){
            u[x[i]].insert(y[i]);
        }
        if(dir[i]=='D'){
            d[x[i]].insert(y[i]);
        }
        if(dir[i]=='L'){
            l[y[i]].insert(x[i]);
        }
        if(dir[i]=='R'){
            r[y[i]].insert(x[i]);
        }
    }
    int ans=INF;
    rep(i,du){
        if(u[i].size()==0||d[i].size()==0)continue;
        erep(j,u[i]){
            if(d[i].lb(j)!=d[i].end()){
                int dum= *d[i].lb(j);
                chmin(ans,5*(dum-j));
               
            }
        }
    }
    rep(i,du){
        if(r[i].size()==0||l[i].size()==0)continue;
        erep(j,r[i]){
            if(l[i].lb(j)!=l[i].end()){
                int dum= *l[i].lb(j);
                chmin(ans,5*(dum-j));
          //       std::cout << ans << std::endl;
            }
        }
    }
  //  std::cout << ans << std::endl;
  
  //ここまでok(上下左右の衝突)
    
    
    map<int,set<int>> uul,rrd,ddl,lld;
    map<int,set<int>> uur,rru,ddr,llu;
    rep(i,n){
        if(dir[i]=='U'){
            rru[x[i]+y[i]].insert(x[i]);
            llu[(200000-x[i])+y[i]].insert(x[i]);
        }
        if(dir[i]=='D'){
            rrd[-x[i]+y[i]].insert(x[i]);
            lld[-(200000-x[i])+y[i]].insert(x[i]);
        }
        if(dir[i]=='R'){
            uur[y[i]+x[i]].insert(y[i]);
            ddr[(200000-y[i])+x[i]].insert(y[i]);
        }
        if(dir[i]=='L'){
            uul[-y[i]+x[i]].insert(y[i]);
            ddl[-(200000-y[i])+x[i]].insert(y[i]);
        }
    }
    rep(i,n){
        if(dir[i]=='U'){
            swap(x[i],y[i]);
            if(uur[y[i]+x[i]].size()!=0){
                if(uur[y[i]+x[i]].lb(x[i])!=uur[y[i]+x[i]].end()){
                    chmin(ans,10*(*uur[y[i]+x[i]].lb(x[i])-x[i]));
                }
            }
            if(uul[y[i]-x[i]].size()!=0){
                if(uul[y[i]-x[i]].lb(x[i])!=uul[y[i]-x[i]].end()){
                    chmin(ans,10*(*uul[y[i]-x[i]].lb(x[i])-x[i]));
                }
            }
        }
        if(dir[i]=='D'){
            swap(x[i],y[i]);
            /*
            std::cout << ddr[y[i]-(200000-x[i])].size() << std::endl;
            std::cout << ddr[y[i]+(200000-x[i])].size() << std::endl;
            std::cout << ddl[y[i]-(200000-x[i])].size() << std::endl;
            std::cout << ddl[y[i]+(200000-x[i])].size() << std::endl;
            */
            if(ddr[y[i]+(200000+x[i])].size()!=0){
                auto it=ddr[y[i]+(200000-x[i])].lb(x[i]);
                if(it!=ddr[y[i]+(200000-x[i])].begin()){
                    it--;
                    chmin(ans,10*(x[i] - *it));
                }
            }
            if(ddl[y[i]-(200000-x[i])].size()!=0){
                auto it=ddl[y[i]-(200000-x[i])].lb(x[i]);
                if(it!=ddl[y[i]-(200000-x[i])].begin()){
                    it--;
                    chmin(ans,10*(x[i] - *it));
                }
            }
        }
        if(dir[i]=='R'){
            if(rru[y[i]+x[i]].size()!=0){
                if(rru[y[i]+x[i]].lb(x[i])!=rru[y[i]+x[i]].end()){
                    chmin(ans,10*(*rru[y[i]+x[i]].lb(x[i])-x[i]));
                }
            }
            if(rrd[y[i]-x[i]].size()!=0){
                if(rrd[y[i]-x[i]].lb(x[i])!=rrd[y[i]-x[i]].end()){
                    chmin(ans,10*(*rrd[y[i]-x[i]].lb(x[i])-x[i]));
                }
            }
            
        }
        if(dir[i]=='L'){
            if(llu[y[i]+(200000-x[i])].size()!=0){
                auto it=llu[y[i]+(200000-x[i])].lb(x[i]);
                if(it!=llu[y[i]+(200000-x[i])].begin()){
                    it--;
                    chmin(ans,10*(x[i] - *it));
                }
            }
            if(lld[y[i]-(200000-x[i])].size()!=0){
                auto it=lld[y[i]-(200000-x[i])].lb(x[i]);
                if(it!=lld[y[i]-(200000-x[i])].begin()){
                    it--;
                    chmin(ans,10*(x[i] - *it));
                }
            }
        }
    }
    if(ans==INF)std::cout << "SAFE" << std::endl;
    else std::cout << ans << std::endl;
}


Measured memory_bytes: 144728