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D1. Kirk and a Binary String (easy version)

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputThe only difference between easy and hard versions is the length of the string. You can hack this problem only if you solve both problems.

Kirk has a binary string $$$s$$$ (a string which consists of zeroes and ones) of length $$$n$$$ and he is asking you to find a binary string $$$t$$$ of the same length which satisfies the following conditions:

- For any $$$l$$$ and $$$r$$$ ($$$1 \leq l \leq r \leq n$$$) the length of the longest non-decreasing subsequence of the substring $$$s_{l}s_{l+1} \ldots s_{r}$$$ is equal to the length of the longest non-decreasing subsequence of the substring $$$t_{l}t_{l+1} \ldots t_{r}$$$;
- The number of zeroes in $$$t$$$ is the maximum possible.

A non-decreasing subsequence of a string $$$p$$$ is a sequence of indices $$$i_1, i_2, \ldots, i_k$$$ such that $$$i_1 < i_2 < \ldots < i_k$$$ and $$$p_{i_1} \leq p_{i_2} \leq \ldots \leq p_{i_k}$$$. The length of the subsequence is $$$k$$$.

If there are multiple substrings which satisfy the conditions, output any.

Input

The first line contains a binary string of length not more than $$$2\: 000$$$.

Output

Output a binary string which satisfied the above conditions. If there are many such strings, output any of them.

Examples

Input

110

Output

010

Input

010

Output

010

Input

0001111

Output

0000000

Input

0111001100111011101000

Output

0011001100001011101000

Note

In the first example:

- For the substrings of the length $$$1$$$ the length of the longest non-decreasing subsequnce is $$$1$$$;
- For $$$l = 1, r = 2$$$ the longest non-decreasing subsequnce of the substring $$$s_{1}s_{2}$$$ is $$$11$$$ and the longest non-decreasing subsequnce of the substring $$$t_{1}t_{2}$$$ is $$$01$$$;
- For $$$l = 1, r = 3$$$ the longest non-decreasing subsequnce of the substring $$$s_{1}s_{3}$$$ is $$$11$$$ and the longest non-decreasing subsequnce of the substring $$$t_{1}t_{3}$$$ is $$$00$$$;
- For $$$l = 2, r = 3$$$ the longest non-decreasing subsequnce of the substring $$$s_{2}s_{3}$$$ is $$$1$$$ and the longest non-decreasing subsequnce of the substring $$$t_{2}t_{3}$$$ is $$$1$$$;

The second example is similar to the first one.

Codeforces (c) Copyright 2010-2020 Mike Mirzayanov

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