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# Repeating Sub-Sequence

Problem Description

Given a string A, Check if the length of the longest repeating sub-sequence is greater than or equal to 2,
A longest repeating sub-sequence is defined such that,
1. the two subsequences have the same string character at the same position
2. any ith character in the two subsequences shouldn’t have the same index in the original string

NOTE: If the Sub-sequence length is greater than or equal to 2 return 1, else return 0.

Problem Constraints

1 <= |A| <= 100

Input Format

The first and only argument of input contains a string A.

Output Format

Return an integer, 0 or 1:

```    => 0 : Length of Repeating subsequence is less than 2
=> 1 : Length of Repeating subsequence is greater than or equal to 2
```

Example Input

Input 1:

``` A = "abab"
```

Input 2:

``` A = "abba"
```

Example Output

Output 1:

``` 1
```

Output 2:

``` 0
```

Example Explanation

Explanation 1:

``` "ab" is repeated.
```

Explanation 2:

``` There is no repeating subsequence.
```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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## Discussion

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