#include <iostream>
#include <math.h>
using namespace std;
int patratperfect(int x)
{
if(sqrt(x)==(int)sqrt(x))
return 1;
else
return 0;
}
int rasturnat(int x)
{
int inv=0;
while(x!=0)
{
inv=inv*10+x%10;
x=x/10;
}
return inv;
}
int main()
{
int a,b,i,k=0;
cin>>a>>b;
for(i=a;i<=b;i++)
{
if(patratperfect(i) && patratperfect(rasturnat(i)))
k=k+1;
}
cout<<k;
return 0;
}