n = int(input())
X = [int(input()) for _ in range(n)]
if n == 1:
    if X[0] == 1 or X[0] == -1:
        print("T")
    else:
        print("F")
else:
    for i in range(n-1):
        if abs(X[i] - X[i+1]) != 1:
            print("F")
            exit()
    print("T")