T = int(input())
X = [0]
flag = 0
for x in range(T):
    X.append(int(input()))
    if X[x] - X[x+1] >1 or X[x] - X[x+1] < -1:
        flag = 1
if X[0] == 0:
    print('F')
elif flag == 0:
    print('T')
elif flag == 1:
    print('F')