T = int(input())

array = []

for i in range(T) :
    array.append(int(input()))

pos = 0
flg = True
for val in array :
    if pos + 1 == val :
        pos += 1
    elif pos -1 == val :
        pos -= 1
    else :
        flg = False
        break

if flg :
    print("T")
else :
    print("F")