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- #include <bits/stdc++.h>
- using namespace std;
- long long a,b,a1,b1;
- int main()
- {
- cin>>a>>b>>a1>>b1;
- if(abs(a-a1)&&abs(b-b1))cout << "YES" << endl;
- else cout<<"NO"<<endl;
- return 0;
- }
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