T = int(input())
X = []
for i in range(0,T) :
    x = int(input())
    X.append(x)
counter = 0
for j in range(0,T-1) :
    if (X[j] - X[j+1] == 1) or (X[j] - X[j+1] == -1) :
        if (X[0] == 1) or (X[0] == -1) :
            counter += 1
if (int(counter) ==  T-1) and ((X[0] == 1) or (X[0] == -1)) :
    print("T")
else :
    print("F")