T = input()
ALL,ALL_DIF =[],[]
for i in range(0,T):
    X = raw_input()
    ALL.append(int(X))

if ALL[0] != 0:
    for i in range(0,T-1):
        ALL_DIF.append(abs(abs(ALL[i+1])-abs(ALL[i])))
        if abs(abs(ALL[i+1])-abs(ALL[i])) == 1:
            pass
            # finish
            if T-2 == i:
                print 'T'
                break
        else:
            print 'F'
            break
else:
    print 'F'