T = gets.to_i
Array = []
T.times { Array << gets.to_i }
#print(Array)
unless Array[0] ==1 or Array[0] ==-1
  hantei=1
 else
  hantei=0
end

for k in (0..(T-2))
  hantei=1  unless (Array[k]-Array[k+1])**2==1
end
 
if hantei==0
  print("T")
else
  print("F")
end