t = int(input())
x = [0]
for i in range(t):
    x.append(int(input())) 


if x[t] % 2 != t % 2:
    j = 'F'

for i in range(t):
    if abs(x[i] - x[i+1]) != 1:
        j = 'F'
        break 
    else:
        pass
else:
    j = 'T'

print (j)