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Problems

Parallelogram

Parallelogram

Time limit 1 second
Memory limit 128 MiB

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 data

Four real numbers a, b, c, d.

Output data

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

Examples

Input example #1
2 4 2 4
Output example #1
YES
Source SFE-2010 Variant 29