#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>
#include <cmath>
#include <stack>


int main (void){
	int n;

	std::cin >> n;

	int pos = 0;

	bool result = true;
	for (size_t i = 0; i < n; i++)
	{
		int next_pos;
		std::cin >> next_pos;

		if (next_pos + 1 == pos || next_pos - 1 == pos) {
			// None
		}
		else {
			result = false;
		}
	}

	std::cout << (result ? "T" : "F") << std::endl;

	return 0;
}