>Given an integer N, return the maximun posible value obtained by deleting '3' digit from the decimal representation of N. N will have atleast one '3'.Ex:
N = 13938 returns 1938
N = -3839 returns -389

等会做，先去吃饭😄，应该就是贪心就好了
```python

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求职面试

Given an integer N, return the maximun posible value obtained by deleting '3' digit from the decimal representation of N. N will have atleast one '3'.Ex:
N = 1