请在hackerrank上找到原始问题
虽然我的解决方案还不完整，但有人能帮我理解我哪里出错了吗？（在第二个函数中，标记器返回一个2个字母的标记，尽管问题要求输入一个3个字母的标记。谢谢你，谢谢

import re
import nltk
import string
final_tagged = ""
raw_input(strs)
def tokenize_two(i):
    temp = i
    global strs
    "remove /?? and pos tag"
    for ch in ['/??']:
        if ch in i:
            i=i.replace(ch,"")
            #pos tagging
    tag = nltk.pos_tag([i])
    for item in tag:
        for ch in ['??']:
            if ch in temp:
                temp = temp.replace(ch,item[1])
    replace = i+"/??"
    strs = string.replace(strs,replace,temp)
    return temp;

def tokenize_three(i):
    "remove /??? and pos tag"
    temp = i 
    global strs
    for ch in ['/???']:
        if ch in i:
            i=i.replace(ch,"")
    tag = nltk.pos_tag([i])
    for item in tag:
        for ch in ['???']:
            if ch in temp:
                temp = temp.replace(ch,item[1])
    replace = i+"/???"
    strs = string.replace(strs,replace,temp)
    return temp;

a = [w for w in re.split('\s+',strs)]
for i in a :
    if(i.endswith("/??")):
        tagged = tokenize_two(i)
    if(i.endswith("/???")):
        final_tagged = tokenize_three(i)
print strs

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