//{{{
#include <bits/stdc++.h>
using namespace std;
#define rep(...) repN((__VA_ARGS__,rep3,rep2,loop,~))(__VA_ARGS__)
#define loop(n) rep2(_loop_,n)
#define rep2(i,n) rep3(i,0,n)
#define rep3(i,begin,end) for(int i=(int)(begin),i##_end=(int)(end);i<i##_end;++i)
#define repN(a) repX a
#define repX(a0,a1,a2,x,...) x
typedef long long ll;
const int MOD = 1e9+7;
//}}}

int main(){
	int T;
	cin >> T;
	int x;
	cin >> x;
	if(abs(x) != 1){
		puts("F");
		return 0;
	}
	int prev = x;
	rep(i, T - 1){
		cin >> x;
		if(abs(prev - x) == 1){
			prev = x;
			continue;
		}
		puts("F");
		return 0;
	}
	puts("T");
	return 0;
}