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

if(T==1):
    if(x[0]=='1' or x[0]=='-1'):
      print('T')
    else:
      print('F')
else:
    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')