#include <iostream>
#include <cmath>
using namespace std;
int ogl(int n)
{
int oglindit = 0;
while (n != 0)
{
int c = n % 10;
oglindit = oglindit * 10 + c;
n /= 10;
}
return oglindit;
}
int main()
{
int a, b;
cin >> a >> b;
if (ogl(a) == a && ogl(b) == b)
{
cout << abs(a - b);
}
else if (ogl(a) == a || ogl(b) == b)
{
if (ogl(a) == a)
{
cout << (int)sqrt(a);
return 0;
}
else
{
cout << (int)sqrt(b);
}
}
else
{
cout << a + b;
}
return 0;
}