t=int(input())
a=list(int(input()) for i in range(t))

count=0
if a[0]!=1 and a[0]!=-1:
    count+=1
for i in range(1,t):
    if a[i]!=a[i-1]+1 and a[i]!=a[i-1]-1:
        count+=1

if count!=0:
    print("F")
else:
    print("T")