t = int(input())
l = []

for i in range(t):
  l.append(abs(int(input())))

def f(t, l):
  if l[0] == 0 or abs(l[0]) > 1:
    return "F"

  for i in range(t-1):
    diff =  abs(l[i] - l[i+1])
    if diff == 1:
      continue
    else:
      return "F"
  
  return "T"

print(f(t, l))