# -*- coding: utf-8 -*-

t = int(input())
x = [0] * (t+1)
for i in range(t):
    x[i+1] = int(input())

answer = True

for i in range(t):
    if abs(x[i] - x[i+1]) == 1:
        pass
    else:
        answer = False

if answer:
    print("T")
else:
    print("F")