def solve():
    t = int(input())
    x = []
    for i in range(t):
        x.append(int(input()))

    pos = 0
    for i in range(t):
        nextPos = x[i]
        if (nextPos - pos not in (1, -1)):
            print('F')
            return
        pos = nextPos

    print('T')


solve()