T = int(input())
list = [0]
f = 0
for i in range(1,T + 1):
    list.append(int(input()))

for i in range(T):
    if list[i] - list[i + 1] != 1 and list[i] - list[i + 1] != -1:
        f += 1
if f == 0:
    print("T")
else:
    print("F")