def main():
    T = int(input())
    X = []
    for _ in range(T):
        X.append(int(input()))

    f = 1
    for i in range(1, T):
        if X[i - 1] + 1 == X[i] or X[i - 1] - 1 == X[i]:
            pass
        else:
            f = 0
            break
    if f == 0:
        print("F")
    else:
        print("T")


if __name__ == "__main__":
    main()