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问题 C: 外语（英）

时间限制: 1 Sec 内存限制: 128 MB
提交: 211 解决: 148
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You are given 4 sticks of lengths a, b, c, and d. You can not break or bend them.

Determine whether it is possible to form a square using the given sticks.

The only line four integers

c, and

d (

1≤a,b,c,d≤10) — the lengths of the sticks.

print "YES" if it is possible to form a square using the given sticks, and "NO" otherwise.

1 1 1 1

YES

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