# Parallelogram

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 128 megabytes

Given four numbers $a,b,c,d$, defining lengths of pieces. Find out, if it is possible to form a parallelogram from these pieces.

## Input

Four real numbers $a,b,c,d$.

## Output

Print a word "YES" if it is possible to form a parallelogram or "NO" otherwise.

## Examples

Input #1

Answer #1

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