n = int(input())
l = [int(input()) for i in range(n)]
L = [abs(l[j]-l[j+1]) for j in range(n-1)]

s = list(set(L))

if s == []:
  if l[0] == 1:
    print('T')
  else:
    print('F')
elif s == [1]:
  print('T')
else:
  print('F')