#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <cctype>
#include <cstdint>
#include <cstdlib>
#include <cmath>
#include <complex>
#include <chrono>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <memory>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <vector>
#include <random>
#include <utility>
#include <limits>
#include <list>
#include <type_traits>

/* template start */
 
#define rep(i, a, b) for (long long i = (a); (i) < (b); (i)++)
#define all(i) i.begin(), i.end()

#ifdef LOCAL
#define debug(...) std::cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif

void debug_out(){std::cerr<<std::endl;}

template<typename Head,typename... Tail>
void debug_out(Head h,Tail... t){
  std::cerr<<" "<<h;
  if(sizeof...(t)>0)std::cout<<" :";
  debug_out(t...);
}
 
template <typename T1, typename T2>
std::ostream& operator<<(std::ostream& os, std::pair<T1, T2> pa) {
  return os << pa.first << " " << pa.second;
}
 
template <typename T>
std::ostream& operator<<(std::ostream& os, std::vector<T> vec) {
  for (std::size_t i = 0; i < vec.size(); i++)os << vec[i] << (i + 1 == vec.size() ? "" : " ");
  return os;
}
 
template<typename T1,typename T2>
inline bool chmax(T1& a,T2 b){return a<b && (a=b,true);}
 
template<typename T1,typename T2>
inline bool chmin(T1& a,T2 b){return a>b && (a=b,true);}

template<typename Num>
constexpr Num mypow(Num a, long long b) {
  if(b==0)return 1;
  if (a==0)return 0;
  Num x = 1;
  while (b > 0) {
    if(b & 1)x*=a;
    a*=a;
    b >>= 1;
  }
  return x;
}

/* template end */

using ll = long long;

int main() {
  std::cin.tie(nullptr);
  std::ios::sync_with_stdio(false);

  ll n;
  std::cin>>n;

  using P=std::pair<ll,ll>;

  std::vector<P> plain[4];

  rep(i,0,n){
    ll x,y;
    std::cin>>x>>y;
    char c;
    std::cin>>c;

    if(c=='R')plain[0].emplace_back(x,y);
    if(c=='U')plain[1].emplace_back(x,y);
    if(c=='L')plain[2].emplace_back(x,y);
    if(c=='D')plain[3].emplace_back(x,y);
  }

  constexpr ll INF=1e18;
  ll ans=INF;

  {
    std::map<ll,std::set<ll>> x_axis;

    for(const auto& e:plain[2]){
      x_axis[e.second].insert(e.first);
    }

    for(const auto& e:plain[0]){
      auto itr=x_axis[e.second].lower_bound(e.first);
      if(itr!=x_axis[e.second].end()){
        chmin(ans,(*itr-e.first)*5);
      }
    }
  }

  
  {
    std::map<ll,std::set<ll>> y_axis;

    for(const auto& e:plain[3]){
      y_axis[e.first].insert(e.second);
    }

    for(const auto& e:plain[1]){
      auto itr=y_axis[e.first].lower_bound(e.second);
      if(itr!=y_axis[e.first].end()){
        chmin(ans,(*itr-e.second)*5);
      }
    }
  }

  {
    std::map<ll,std::set<ll>> axis;
    for(const auto& e:plain[2]){
      axis[e.second-e.first].insert(e.first);
    }

    for(const auto& e:plain[1]){
      auto itr=axis[e.second-e.first].lower_bound(e.first);
      if(itr!=axis[e.second-e.first].end()){
        chmin(ans,(*itr-e.first)*10);
      }
    }
  }
  
  {
    std::map<ll,std::set<ll>> axis;
    for(const auto& e:plain[3]){
      axis[e.second-e.first].insert(e.first);
    }

    for(const auto& e:plain[0]){
      auto itr=axis[e.second-e.first].lower_bound(e.first);
      if(itr!=axis[e.second-e.first].end()){
        chmin(ans,(*itr-e.first)*10);
      }
    }
  }

  {
    std::map<ll,std::set<ll>> axis;
    for(const auto& e:plain[1]){
      axis[e.second+e.first].insert(e.first);
    }

    for(const auto& e:plain[0]){
      auto itr=axis[e.second+e.first].lower_bound(e.first);
      if(itr!=axis[e.second+e.first].end()){
        chmin(ans,(*itr-e.first)*10);
      }
    }
  }
  
  {
    std::map<ll,std::set<ll>> axis;
    for(const auto& e:plain[2]){
      axis[e.second+e.first].insert(e.first);
    }

    for(const auto& e:plain[3]){
      auto itr=axis[e.second+e.first].lower_bound(e.first);
      if(itr!=axis[e.second+e.first].end()){
        chmin(ans,(*itr-e.first)*10);
      }
    }
  }

  if(ans!=INF)std::cout<<ans<<"\n";
  else std::cout<<"SAFE\n";

  return 0;
}

Measured memory_bytes: 33952