#include <stdio.h>
#include <algorithm>

//627
int main() {
	int t, p = 0, x, flag = 0;
	scanf("%d", &t);
	for (int i = 0; i < t; i++) {
		scanf("%d", &x);
		if (1 != abs(p - x))
			flag = true;
		p = x;
	}
	printf("%s\n", flag ? "F" : "T");
}