def solve():
    while 1:
        try:
            t = int(input())
            if t == 1:
                print("T")
                raise EndLoop
            X = []
            for _ in range(t):
                tmp = int(input())
                X.append(tmp)

            flag = True
            for i in range(1, t):
                if abs(X[i] - X[i - 1]) > 1 or abs(X[i] - X[i - 1]) == 0:
                    print("F")
                    flag = False
                    break

            if flag:
                print("T")

            break
        except:
            break


solve()