#include <bits/stdc++.h>

#define el '\n'

typedef long long ll;
typedef long double ld;

#define Beevo ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

void testCase() {
    ll a, b;
    cin >> a >> b;

    int cnt = 0;
    for (int i = 1; 1LL * i * i <= b; i++) {
        if (1LL * i * i < a)
            continue;

        string s = to_string(1LL * i * i);

        reverse(s.begin(), s.end());

        if (s[0] == '0')
            continue;

        int sq = sqrt(stoll(s));

        cnt += stoll(s) >= a && stoll(s) <= b && 1LL * sq * sq == stoll(s);
    }

    cout << cnt;
}

signed main() {
    Beevo

    int t = 1;
//    cin >> t;

    while (t--)
        testCase();

    return 0;
}