def random_walk(data):
	
	i = 1
	t = 0
	for i in range(len(data) - 1):
		if data[i] + 1 == abs(data[i + 1]) or data[i] - 1 == abs(data[i + 1]):
			t = t + 1
	

	if t == len(data) - 2 and data[1] != 0:
		print("T")
	else:
		print("F")
		
data = input()
random_walk(data)