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Last Updated: 19 Sep, 2020

Difficulty: Moderate

```
Suppose given input is "abacb", then the length of the longest substring without repeating characters will be 3 ("acb").
```

```
Each input contains a single line which contains the string 'S', Where 'S' denotes the input string containing english letters ( both UpperCase and LowerCase), digits, symbols, and spaces.
```

```
Print a single integer denoting the length of the longest substring without repeating characters.
```

```
You do not need to print anything, it has already been taken care of. Just implement the given function.
```

```
0 <= L <= 10^5
Time limit: 1 sec
```

```
Can you solve this problem in O(L) time and space complexity?
```

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