//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
using namespace std;

#define endl '\n'
#define lfs cout<<fixed<<setprecision(10)
#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()
#define spa << " " <<
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = (n); i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = (ll)(m) - 1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD1 = 1e9+7;
const ll MOD9 = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T1, typename T2>
bool chmin(T1 &a,T2 b){if(a>b){a=b;return true;}else return false;}
template<typename T1, typename T2>
bool chmax(T1 &a,T2 b){if(a<b){a=b;return true;}else return false;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>
void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}  
template<typename T>
void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>&v,ll h,ll w){for(ll i=0;i<h;i++)
{for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>
void debug(vector<T>&v,ll n){if(n!=0)cout<<v[0];
for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>
vector<vector<T>>vec(ll x, ll y, T w){
  vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
vector<ll>dx={1,-1,0,0,1,1,-1,-1};
vector<ll>dy={0,0,1,-1,1,-1,1,-1};
template<typename T>
vector<T> make_v(size_t a,T b){return vector<T>(a,b);}
template<typename... Ts>
auto make_v(size_t a,Ts... ts){
  return vector<decltype(make_v(ts...))>(a,make_v(ts...));
}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2>&p){
  return os << p.first << " " << p.second;
}
//mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());

int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res=0,buf=0;
  bool judge = true;
  ll n;cin>>n;
  map<ll,vector<P>>mpx,mpy,mpxy,mpyx;
  vector<ll>x(n),y(n),d(n);
  string str="RLUD";
  rep(i,0,n){
    cin>>x[i]>>y[i];
    char c;cin>>c;
    rep(j,0,4)if(str[j]==c)d[i]=j;
    //cout<<x[i] spa y[i] spa d[i]<<endl;
    if(d[i]<2)mpx[y[i]].EB(x[i],d[i]);
    else mpy[x[i]].EB(y[i],d[i]);
    mpxy[x[i]+y[i]].EB(x[i],d[i]);
    //cout<<x[i]-y[i] spa x[i] spa d[i]<<endl;
    mpyx[x[i]-y[i]].EB(x[i],d[i]);
  }
  const ll inf=1e12;
  ll ret=inf;
  auto f=[&](map<ll,vector<P>>&mp,vector<ll>v){
    //v:方向数->対応関係 0:1 及び 2:3に直す
    ll ret=inf;
    //cout<<"nxt"<<endl;
    for(auto &g:mp){
      //cout<<g.fi spa g.se.size() spa "sz"<<endl;
      sort(ALL(g.se));
      vector<ll>mx(4,-INF);
      for(auto z:g.se){
        //cout<<z<<endl;
        if(v[z.se]&1)chmin(ret,z.fi-mx[v[z.se]^1]);
        mx[v[z.se]]=z.fi;
      }
    }
    //cout<<ret<<endl;
    return ret;
  };
  chmin(ret,f(mpx,{0,1,2,3})*5);
  chmin(ret,f(mpy,{0,1,2,3})*5);
  chmin(ret,f(mpxy,{0,3,1,2})*10);
  chmin(ret,f(mpyx,{0,3,2,1})*10);
  ans(ret==inf,"SAFE",ret);
  return 0;
}

Measured memory_bytes: 72848