N = int(input())
s = []
b = 0
for i in range(N):
    a = input()
    s.append(int(a))
for i in range(N-1):
    if abs(s[i] - s[i+1]) != 1:
        b += 1
if s[0] == 0:
    b += 1
if abs(s[0]-0) != 1:
    b += 1
if b == 0:
    print("T")
else:
    print("F")