Problems
Parallelogram
Parallelogram
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