# Exchange of numbers 3

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 64 megabytes

At the input of the program we have a natural number $n(n>99)$. In the number $n$, you need to exchange the hundreds and tens digits.

## Input

Natural number $n(n>99)$.

## Output

The answer to the problem.

## Examples

Input #1

Answer #1

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