T=int(input())
x=[]
for i in range(T):
    x.append(input())

for i in range(T-1):
    if(x[0]=='0'):
        print('F')
        break
    if(abs(int(x[i])-int(x[i+1]))!=1):
           print('F')
           break
    if(i==T-2):
       print('T')