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
#print(hantei)
for k in (0..T-2)
  hantei1=1  unless Array[k]-Array[k+1]=1 or Array[k]-Array[k+1]=-1
end
 
 if hantei=1
   print("F")
 else
   print("T")
 end