def menu():
    print( '(1) EXPANDED SUM\n'
'(2) REVERSE EXPANDED SUM\n'
'(3) REVERSE INTERGER\n'
'(4) PRODUCT TABLE\n'
'(5) EXIT\n')

def poscheck():
    while True:
        global n
        n = input('Please enter a positive interger: ')
        v = int(n)
        if v > 0:
            return
        else:
            continue
        return

def printSum(n, reverse):
    sum = 0
    running = ''
    for num in range(n) :
        num += 1
        sum += num
        if (reverse == True):
            running = str(num) + running
        else:
            running += str(num)
        if (n == num):
            running += '='+ str(sum)
        else:
            if (reverse == True):
                running = '+'+ running
            else:
                running += '+'
    print(running)

def reverseint(n):
    print(int(str(n)[::-1]))

def printProductTable(n):
    for row in range(1,n+1):
        print(*("{:3}".format(row*col) for col in range(1, n+1)))

menu()

x = input('Please choose option 1, 2, 3, 4, or 5: ')

x = int(x)

if x == 5:
    quit()

poscheck()

if (x == 1):
    reverse = False
    n = int(n)
    printSum(n, reverse)

if (x == 2):
    reverse = True
    n = int(n)
    printSum(n, reverse)

if (x == 3):
    reverseint(n)

if (x == 4):
    printProductTable(n)

while True:
    menu()