def solve():
    t = int(input())
    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")


solve()