#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int t,x,y;
  bool flag=true;
  cin>>t>>y;
  if(!(y-1==0||y+1==0)){
    flag=false;
  }else{
	  rep(i,t-1){
	    cin>>x;
	    if(!(y-1==x||y+1==x)){
	      //cout<<y<<" "<<x<<endl;
	      flag=false;
	    }
	    y=x;
	  }
  }
  cout<<(flag?'T':'F')<<endl;
}