//set many funcs template
//Ver.20190820
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<stdbool.h>
#include<time.h>
#include<assert.h>
#define inf 1072114514
#define llinf 4154118101919364364
#define mod 1000000007
#define pi 3.1415926535897932384

int max(int a,int b){if(a>b){return a;}return b;}
int min(int a,int b){if(a<b){return a;}return b;}
int zt(int a,int b){return max(a,b)-min(a,b);}
int round(int a,int b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;}
int ceil(int a,int b){if(a%b==0){return a/b;}return (a/b)+1;}
int gcd(int a,int b){int c;while(b!=0){c=a%b;a=b;b=c;}return a;}
int lcm(int a,int b){int c=gcd(a,b);a/=c;return a*b;}
int nCr(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
int nHr(int a,int b){return nCr(a+b-1,b);}
int fact(int a){int i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}
int pow(int a,int b){int i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}
int dsum(int x){int r=0;while(x){r+=(x%10);x/=10;}return r;}
int dsumb(int x,int b){int r=0;while(x){r+=(x%b);x/=b;}return r;}
int sankaku(int x){return ((1+x)*x)/2;}
void swap(int *a,int *b){int c;c=(*a);(*a)=(*b);(*b)=c;}
long long llmax(long long a,long long b){if(a>b){return a;}return b;}
long long llmin(long long a,long long b){if(a<b){return a;}return b;}
long long llzt(long long a,long long b){return llmax(a,b)-llmin(a,b);}
long long llround(long long a,long long b){if((a%b)*2 >= b){return (a/b)+1;}return a/b;}
long long llceil(long long a,long long b){if(a%b==0){return a/b;}return (a/b)+1;}
long long llgcd(long long a,long long b){long long c;while(b!=0){c=a%b;a=b;b=c;}return a;}
long long lllcm(long long a,long long b){long long c=llgcd(a,b);a/=c;return a*b;}
long long llnCr(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
long long llnHr(long long a,long long b){return llnCr(a+b-1,b);}
long long llfact(long long a){long long i,r=1;for(i=1;i<=a;i++){r*=i;}return r;}
long long llpow(long long a,long long b){long long i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}
long long lldsum(long long x){long long r=0;while(x){r+=(x%10);x/=10;}return r;}
long long lldsumb(long long x,long long b){long long r=0;while(x){r+=(x%b);x/=b;}return r;}
long long llsankaku(long long x){return ((1+x)*x)/2;}
void llswap(long long *a,long long *b){long long c;c=(*a);(*a)=(*b);(*b)=c;}
double dbmax(double a,double b){if(a>b){return a;}return b;}
double dbmin(double a,double b){if(a<b){return a;}return b;}
double dbzt(double a,double b){return dbmax(a,b)-dbmin(a,b);}
void dbswap(double *a,double *b){double c;c=(*a);(*a)=(*b);(*b)=c;}
void chswap(char *a,char *b){char c;c=(*a);(*a)=(*b);(*b)=c;}
int sortfncsj(const void *a,const void *b){if(*(int *)a>*(int *)b){return 1;}if(*(int *)a==*(int *)b){return 0;}return -1;}
int sortfnckj(const void *a,const void *b){if(*(int *)a<*(int *)b){return 1;}if(*(int *)a==*(int *)b){return 0;}return -1;}
int llsortfncsj(const void *a,const void *b){if(*(long long *)a>*(long long *)b){return 1;}if(*(long long *)a==*(long long *)b){return 0;}return -1;}
int llsortfnckj(const void *a,const void *b){if(*(long long *)a<*(long long *)b){return 1;}if(*(long long *)a==*(long long *)b){return 0;}return -1;}
int dbsortfncsj(const void *a,const void *b){if(*(double *)a>*(double *)b){return 1;}if(*(double *)a==*(double *)b){return 0;}return -1;}
int dbsortfnckj(const void *a,const void *b){if(*(double *)a<*(double *)b){return 1;}if(*(double *)a==*(double *)b){return 0;}return -1;}
int strsortfncsj(const void *a,const void *b){return strcmp((char *)a,(char *)b);}
int strsortfnckj(const void *a,const void *b){return strcmp((char *)b,(char *)a);}
int chsortfncsj(const void *a,const void *b){if(*(char *)a>*(char *)b){return 1;}if(*(char *)a==*(char *)b){return 0;}return -1;}
int chsortfnckj(const void *a,const void *b){if(*(char *)a<*(char *)b){return 1;}if(*(char *)a==*(char *)b){return 0;}return -1;}

void shuffledget(int x[],int n){
    int i,b[524288],p,c;
    for(i=0;i<n;i++){
        b[i]=i;
    }
    for(i=n;i>=1;i--){
        p=rand()%i;
        c=b[i-1];b[i-1]=b[p];b[p]=c;
    }
    for(i=0;i<n;i++){
        scanf("%d",&x[b[i]]);
    }
}

int dx4[4]={1,-1,0,0};
int dy4[4]={0,0,1,-1};
int dx8[8]={-1,-1,-1,0,0,1,1,1};
int dy8[8]={-1,0,1,-1,1,-1,0,1};

int search(int x,int a[],int n){
    int st=0,fi=n-1,te;
    while(st<=fi){
        te=(st+fi)/2;
        if(a[te]<x){st=te+1;}else{fi=te-1;}
    }
    return st;
}

void prarr(int arr[],int n){
  int i;
  for(i=0;i<n;i++){
    if(i){printf(" ");}
    printf("%d",arr[i]);
  }
  printf("\n");
  return;
}

void getperm(int a[],int n){
  int i,p;
  for(i=0;i<n;i++){
    a[i]=i;
  }
  for(i=n-1;i>=1;i--){
    p=rand()%(i+1);
    swap(&a[p],&a[i]);
  }
}

typedef struct{
long long x;
long long y;
long long lp;
long long pp;
long long kind;
}sd;

int sortfnc(const void *a,const void *b){
if(((sd*)a)->lp < ((sd*)b)->lp){return -1;}
if(((sd*)a)->lp > ((sd*)b)->lp){return 1;}
if(((sd*)a)->pp < ((sd*)b)->pp){return -1;}
if(((sd*)a)->pp > ((sd*)b)->pp){return 1;}
return 0;
}

long long kcal(char a){
  if(a=='D'){return 0;}
  if(a=='L'){return 1;}
  if(a=='U'){return 2;}
  if(a=='R'){return 3;}
  return -1;
}

long long invalid(long long a,long long b){
  if(a==3){return 0;}
  if(a==2){
    if(b==3){return 1;}
    return 0;
  }
  if(a==1){return 1;}
  if(b==1){return 0;}
  return 1;
}

long long calc(sd dat[],long long c,long long fl){
  long long i,r=llinf,d;
  for(i=1;i<c;i++){
    if(dat[i].lp!=dat[i-1].lp){continue;}
    if(dat[i].kind==dat[i-1].kind){continue;}
    if(invalid(dat[i-1].kind,dat[i].kind)){continue;}
    d=llzt(dat[i].x,dat[i-1].x)+llzt(dat[i].y,dat[i-1].y);
    d*=5;
    r=llmin(r,d);
  }
  return r;
}

int main(void){
  long long n,x[524288],y[524288],r=llinf,i;
  char d[524288][2];
  sd dat[524288];
  sd gr1[524288],gr2[524288];
  long long g1c,g2c;
  scanf("%lld",&n);
  for(i=0;i<n;i++){
    scanf("%lld%lld%s",&x[i],&y[i],d[i]);
    dat[i].x=x[i];
    dat[i].y=y[i];
    dat[i].kind=kcal(d[i][0]);
  }
  
  g1c=0;g2c=0;
  for(i=0;i<n;i++){
    if(dat[i].kind==1 || dat[i].kind==2){
      gr1[g1c].x=dat[i].x;
      gr1[g1c].y=dat[i].y;
      gr1[g1c].kind=dat[i].kind;
      gr1[g1c].lp=dat[i].x-dat[i].y;
      gr1[g1c].pp=dat[i].x+dat[i].y;
      g1c++;
    }
    else{
      gr2[g2c].x=dat[i].x;
      gr2[g2c].y=dat[i].y;
      gr2[g2c].kind=dat[i].kind;
      gr2[g2c].lp=dat[i].x-dat[i].y;
      gr2[g2c].pp=dat[i].x+dat[i].y;
      g2c++;
    }
  }
  qsort(gr1,g1c,sizeof(gr1[0]),sortfnc);
  qsort(gr2,g2c,sizeof(gr2[0]),sortfnc);
  r=llmin(calc(gr1,g1c,0),r);
  r=llmin(calc(gr2,g2c,0),r);

  g1c=0;g2c=0;
  for(i=0;i<n;i++){
    if(dat[i].kind==0 || dat[i].kind==1){
      gr1[g1c].x=dat[i].x;
      gr1[g1c].y=dat[i].y;
      gr1[g1c].kind=dat[i].kind;
      gr1[g1c].lp=dat[i].x+dat[i].y;
      gr1[g1c].pp=dat[i].x-dat[i].y;
      g1c++;
    }
    else{
      gr2[g2c].x=dat[i].x;
      gr2[g2c].y=dat[i].y;
      gr2[g2c].kind=dat[i].kind;
      gr2[g2c].lp=dat[i].x+dat[i].y;
      gr2[g2c].pp=dat[i].x-dat[i].y;
      g2c++;
    }
  }
  qsort(gr1,g1c,sizeof(gr1[0]),sortfnc);
  qsort(gr2,g2c,sizeof(gr2[0]),sortfnc);
  r=llmin(calc(gr1,g1c,0),r);
  r=llmin(calc(gr2,g2c,0),r);
  
  g1c=0;g2c=0;
  for(i=0;i<n;i++){
    if(dat[i].kind==0 || dat[i].kind==2){
      gr1[g1c].x=dat[i].x;
      gr1[g1c].y=dat[i].y;
      gr1[g1c].kind=dat[i].kind;
      gr1[g1c].lp=dat[i].x;
      gr1[g1c].pp=dat[i].y;
      g1c++;
    }
    else{
      gr2[g2c].x=dat[i].x;
      gr2[g2c].y=dat[i].y;
      gr2[g2c].kind=dat[i].kind;
      gr2[g2c].lp=dat[i].y;
      gr2[g2c].pp=dat[i].x;
      g2c++;
    }
  }
  qsort(gr1,g1c,sizeof(gr1[0]),sortfnc);
  qsort(gr2,g2c,sizeof(gr2[0]),sortfnc);
  r=llmin(calc(gr1,g1c,1),r);
  r=llmin(calc(gr2,g2c,1),r);
  
  if(r==llinf){puts("SAFE");return 0;}
  printf("%lld\n",r);
  return 0;
}


Measured memory_bytes: 31448