def check_digit(number):

    isNeg = False
    if number[0] in "-":
        isNeg = True
        if number[1:].isdigit() == False:
            print "not happening"
            press_enter()
        return number[1:].isdigit(), isNeg
    elif number[0] in "+":
        isNeg = False
        if number[1:].isdigit() == False:
            print "not happening"
            press_enter()
        return number[1:].isdigit(), isNeg

    elif number.isdigit() == False:
        print "not happening"
        press_enter()