T = int(input())
X = [abs(int(input())) for _ in range(T)]
X.insert(0, 0)
for j in range(T):
    if (X[j]-X[j+1]) == 1 or (X[j+1]-X[j]) == 1:
        ans = 'T'
    else:
        ans = 'F'
        break
print(ans)