n=int(input())
s=[int(input()) for i in range(n)]

bool_list = []

for i in range(len(s) - 1):
    bool = ((s[i] + 1) == s[i + 1]) or ((s[i] - 1) == s[i + 1])
    bool_list.append(bool)

if len(s) == 1:
    if s[0] == 1:
        print("T")
    else:
        print("F")
else:
    if (len(s)-1) == bool_list.count(True):
        print("T")
    else:
        print("F")