Python While loop that accepts only integer

I have this loop and I am having difficulty making it to accept online integer. No string.

def addItem(menu, order):
    # get item no from user
    itemNo = int(input('your choice : '))
    # validate item no
    if itemNo == -1:
        return itemNo
    while itemNo not in range(1, len(menu) + 1):
        itemNo = int(input('Invalid input, try again: '))
        if itemNo == -1:
            return itemNo