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// четырехзначное число
#include <iostream>
using namespace std;
int main()
{
int a;
cin >> a;
if (a / 1000 - a % 10 == a / 100 - a / 1000 * 10 + (a % 100 - a % 10) / 10)
{
cout << "yes";
}
else
{
cout << "no";
}
return 0;
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