#include <bits/stdc++.h>
using namespace std;
int a, b, ans = 0, n;
char *str = NULL;
size_t i, j, k, d, e;
void toString(char *&str, int n) {
unsigned int size = ceil(log10(n)) + 2;
if (str == NULL) {
str = (char *)malloc(size * sizeof(char));
} else {
str = (char *)realloc(str, size * sizeof(char));
}
if (n == 0) {
str[0] = '0';
return;
}
for (size_t i = 0; n > 0; i++) {
str[i] = '0' + n % 10;
n /= 10;
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cin >> a >> b;
for (n = a; n <= b; n++) {
toString(str, n);
for (i = 0; i < strlen(str); i++) {
for (j = 2; j <= strlen(str) - i; j++) {
e = j / 2;
d = i + e + j % 2;
for (k = i; k < d; k++) {
if (str[k] != str[i + i + e + j - k - 2]) {
break;
}
if (k == d - 1) {
goto next;
}
}
}
}
ans++;
next:
continue;
}
cout << ans << '\n';
}
