#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

ll rev(ll x) {
    ll ret = 0;
    for (; x; x /= 10) {
        if (ret == 0 and x % 10 == 0)
            return -1;
        ret = ret * 10 + x % 10;
    }
    return ret;
}

int main() {
    ios::sync_with_stdio(false); cout.tie(nullptr); cin.tie(nullptr);
    vector<ll> numbers;
    for (ll i = 1; i * i <= 1e11l; ++i) {
        ll number = i * i;
        ll tmp = rev(number);
        if (tmp == -1) continue;
        ll s = sqrtl(tmp);
        if (s * s != tmp)
            continue;
        numbers.push_back(number);
    }
    ll a, b;
    cin >> a >> b;
    int s = (int) (lower_bound(numbers.begin(), numbers.end(), a) - numbers.begin());
    int e = (int) (upper_bound(numbers.begin(), numbers.end(), b) - numbers.begin());
    cout << e - s << '\n';
    return 0;
}