#include <iostream>
#include <vector>
#include <queue>
#include <fstream>
#include <array>
using namespace std;


int main()
{
    vector<int> palindromes;
    for(int i = 1; i <= 99999; i++) {
        vector<int> v;
        int n = i;
        while(n > 0) {
            int digit = n % 10;
            v.push_back(digit);
            n /= 10;
        }
        int l = 0, r = (int) v.size() - 1;
        bool ok = true;
        while(l < r) {
            if(v[l] == v[r]) {
                l++;
                r--;
            }
            else {
                ok = false;
                break;
            }
        }
        if(ok) {
            palindromes.push_back(i);
        }
    }
    
    int S, E;
    cin >> S >> E;
    
    queue<int> Q;
    Q.push(S);
    Q.push(0);
    
    vector<bool> visited(100000, false);
    while(!Q.empty()) {
        int number = Q.front();
        Q.pop();
        int cekor = Q.front();
        Q.pop();
        
        if(number == E) {
            cout << cekor << endl;
            return 0;
        }
        
        for(int i = 0; i < palindromes.size(); i++) {
            if(palindromes[i] < number and palindromes[i] + number <= E and !visited[palindromes[i] + number]) {
                Q.push(palindromes[i] + number);
                Q.push(cekor + 1);
                visited[palindromes[i] + number] = true;
            }
        }
    }
    
    return 0;
}