codeforces 867A

#include<bits/stdc++.h>
using namespace std;
int main(){

          int n,f=0,s=0,i;
          string str;
          cin>>n;
          cin.ignore(numeric_limits<streamsize>::max(),'\n');
          cin>>str;
          for(i=0;i<n;i++){
                    if(str[i]=='F' && str[i+1]=='S')
                               f++;

                    else if(str[i]=='S' && str[i+1]=='F')
                               s++;
          }
          if(s>f)
                    cout<<"YES"<<endl;
          else
                    cout<<"NO"<<endl;
}