error on line 1
"""
exercise for writing out positive integers
in english. chunk_two can be extended.
"""
#language model
chunk_one=('','one',('two','twen'),('three','thir'),'four',('five','fif'),'six','seven',('eight','eigh'),'nine')
chunk_two=('teen','ty','hundred','thousand','million','billion')
exception={10:'ten', 11:'eleven',12:'twelve'}
num=None

"""
numbers up to 99 because of language
inconsistencies
"""
def to99(n):
    if n in exception:
        return exception[n]
    else:
        if n<10:
            if n in (2,3,5,8):
                return chunk_one[n][0]
            else:
                return chunk_one[n]
        elif n<20:
            if n-10 in (2,3,5,8):
                return chunk_one[n-10][1]+chunk_two[0]
            else:
                return chunk_one[n-10]+chunk_two[0]
        else:
            dec=int(n//10)
            uno=int(n%10)
            if dec in (2,3,5,8):
                temp= chunk_one[dec][1]+chunk_two[1]
            else:
                temp= chunk_one[dec]+chunk_two[1]
            if uno in (2,3,5,8):
                return temp+chunk_one[uno][0]
            else:
                return temp+chunk_one[uno]

def hundred(n):
    h=int(n//100)
    d=int(n%100)
    output=''
    if h>0:
        output+=' '+to99(h)+chunk_two[2]
    if d>0:
        output+=' '+to99(d)
    return output

while num!= 0:
    num=int(input('integer up to 10^{0}, 0 to exit:  '.format(len(chunk_two))))
    #blocks of 10^3^x
    blocks=len(str(num))//3
    #incomplete blocks
    icblocks=len(str(num))%3

    output=''
    t1=0
    if icblocks>0:
        t1=len(str(num))-blocks*3
        icblock=str(num)[0:t1]
        if blocks>0:
            output+=hundred(int(icblock))+' '+chunk_two[blocks+2]
        else:
            output+=hundred(int(icblock))
    if blocks>0:    
        loops=list(range(blocks))
        for i in loops:
            step=t1+i*3
            block=str(num)[step:step+3]
            if int(block)>0:
                if i==blocks-1:
                    output+=hundred(int(block))    
                else:
                        output+=hundred(int(block))+' '+chunk_two[len(chunk_two)-i-2]
    print(output)
else:
    print('goodbye')