// warm heart, wagging tail,and a smile just for you!
//                                                                     ███████████
//                                                                   ███╬╬╬╬╬╬╬╬╬╬███
//                                                                ███╬╬╬╬╬████╬╬╬╬╬╬███
//                                            ███████████       ██╬╬╬╬╬████╬╬████╬╬╬╬╬██
//                                      █████████╬╬╬╬╬████████████╬╬╬╬╬██╬╬╬╬╬╬███╬╬╬╬╬██
//                               ████████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬██╬╬╬╬╬╬╬██
//                             ████╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████████╬╬╬╬╬╬╬╬╬╬╬██
//                           ███╬╬╬█╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬███╬╬╬╬╬╬╬█████
//                         ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬████████╬╬╬╬╬██
//                       ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬╬╬╬╬███
//                     ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬██
//                 ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬████
//     █████████████╬╬╬╬╬╬╬╬██╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬██████
//   ████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬██████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████╬╬╬╬╬╬╬███████████╬╬╬╬╬╬╬╬██╬╬╬██╬╬╬██
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████╬╬╬╬╬╬╬╬╬╬╬█╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬██
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬▓▓▓▓▓▓╬╬╬████╬╬████╬╬╬╬╬╬╬▓▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬███
// ██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██████▓▓▓▓▓▓▓╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬▓▓▓▓▓▓▓██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██╬╬╬╬█████
// ███╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████████
//   ███╬╬╬╬╬╬╬╬╬╬╬╬╬█████╬╬╬╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬███╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬██
//       ██████████████  ████╬╬╬╬╬╬███████████████████████████╬╬╬╬╬██╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬╬████
//                         ███████                           █████  ███████████████████  
//
#include "bits/stdc++.h"
using namespace std;
#define INF (1<<30)
#define LINF (1LL<<60)
#define fs first
#define sc second
#define int long long
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FOR2(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i,a,b) for(int i = (b-1);i>=(a);--i)
#define RFOR2(i,a,b) for(int i = (b);i>=(a);--i)
#define REP(i,n)  FOR(i,0,(n))
#define REP2(i,n)  FOR2(i,0,(n))
#define RREP(i,n) RFOR(i,0,(n))
#define RREP2(i,n) RFOR2(i,0,(n))
#define ITR(itr,mp) for(auto itr = (mp).begin(); itr != (mp).end(); ++itr)
#define RITR(itr,mp) for(auto itr = (mp).rbegin(); itr != (mp).rend(); ++itr)
#define range(i,a,b) ((a)<=(i) && (i)<(b))
#define debug(x)  cout << #x << " = " << (x) << endl
#define SP << " " << 
template<typename T1,typename T2> inline bool chmin(T1 &a,T2 b){if(a>b) {a=b; return true;} else return false;}
template<typename T1,typename T2> inline bool chmax(T1 &a,T2 b){if(a<b) {a=b; return true;} else return false;}
#define MSB(x) (63-__builtin_clzll(x))
#define pcnt(x) (__builtin_popcountll(x))
#define parity(i,j) (i&(1LL<<j))
typedef pair<int,int> P;
typedef tuple<int,int,int> T;
typedef vector<int> vec;
typedef vector<vector<int>> mat;

vec idx[202020],idy[202020],idz[404040], idw[404040];
void solve(){
  int N;
  cin >> N;

  vec x(N),y(N);
  vector<char> c(N);
  REP(i,N){
    cin >> x[i] >> y[i] >> c[i];
    idx[x[i]].push_back(i);
    idy[y[i]].push_back(i);
    idz[x[i]+y[i]].push_back(i);
    idw[y[i]-x[i]+200000].push_back(i);

   // cout << x[i]+y[i] SP x[i]-y[i] << endl;
  }

  int ans = INF;
  // jouge
  REP(i,202020){
    vec r, d, u, l;
    for(int v:idx[i]){
      if(c[v]=='D') d.push_back(y[v]);
      if(c[v]=='U') u.push_back(y[v]);
    }
    for(int v:idy[i]){
      if(c[v]=='R') r.push_back(x[v]);
      if(c[v]=='L') l.push_back(x[v]);
    }
    sort(r.begin(),r.end());
    sort(d.begin(),d.end());
    sort(u.begin(),u.end());
    sort(l.begin(),l.end());
    int in = 0;
    REP(j,r.size()){
      while(in < l.size() && r[j] > l[in]) in++;
      if(in < l.size()) chmin(ans,(l[in]-r[j])*5);
    } 

    in = 0;
    REP(j,u.size()){
      while(in < d.size() && u[j] > d[in]) in++;
      if(in < d.size()) chmin(ans,(d[in]-u[j])*5);
    } 
  }

 // debug(ans);

  //taikaku
  REP(i,404040){
    vec r, d, u, l;
    for(int v:idw[i]){
      if(c[v]=='R') r.push_back(x[v]);
      if(c[v]=='D') d.push_back(x[v]);
      if(c[v]=='U') u.push_back(x[v]);
      if(c[v]=='L') l.push_back(x[v]);
    }
    sort(r.begin(),r.end());
    sort(d.begin(),d.end());
    sort(u.begin(),u.end());
    sort(l.begin(),l.end());

    int in = 0;
    REP(j,r.size()){
      while(in < d.size() && r[j] > d[in]) in++;
      if(in < d.size()) chmin(ans,(d[in]-r[j])*10);
    } 

    in = 0; 
    REP(j,u.size()){
      while(in < l.size() && u[j] > l[in]) in++;
      if(in < l.size()) chmin(ans,(l[in]-u[j])*10);
    } 
  }
   // debug(ans);

  REP(i,404040){
    vec r, d, u, l;
    for(int v:idz[i]){
      if(c[v]=='R') r.push_back(x[v]);
      if(c[v]=='D') d.push_back(x[v]);
      if(c[v]=='U') u.push_back(x[v]);
      if(c[v]=='L') l.push_back(x[v]);
    }
    sort(r.begin(),r.end());
    sort(d.begin(),d.end());
    sort(u.begin(),u.end());
    sort(l.begin(),l.end());

    int in = 0;
    REP(j,r.size()){
      while(in < u.size() && r[j] > u[in]) in++;
      if(in < u.size()) chmin(ans,(u[in]-r[j])*10);
    } 

    in = 0; 
    REP(j,d.size()){
      while(in < l.size() && d[j] > l[in]) in++;
      if(in < l.size()) chmin(ans,(l[in]-d[j])*10);
    } 
  }

  assert(ans > 0);
  if(ans == INF) cout << "SAFE" << endl;
  else cout << ans << endl;
}

signed main(){
  ios::sync_with_stdio(false);
  cin.tie(0);

  int T = 1;
  // cin >> T;

  while(T--) solve();

  return 0;
}

Measured memory_bytes: 57704