A_v3

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#define pii pair <int, int>
using namespace std;

bool sh = 0;

int dif(int x) {
    string s = to_string(x);
    int minim = 10, maxim = -1;
    for (char l: s) {
        int k = (int)l - (int)'0';
        if (k < minim) minim = k;
        if (k > maxim) maxim = k;
    }
    return maxim - minim;
}

int seek(int l, int r) {
    pii bst = {-1, -1};
    for (int i = l; i <= r; ++i) {
        int d = dif(i);
        if (d > bst.first) {
            bst = {d, i};
        }
    }
    return bst.second;
}

int get(int x) {
    string s = to_string(x);

    while (1) {
        if (sh) {
            cout << "x = " << x << "\n";
        }
        s = to_string(x);
        int minim=10, maxim=-1;
        for (char l: s) {
            int k = (int)l - (int)'0';

            if (k < minim) minim = k;
            if (k > maxim) maxim = k;
        }
        if (sh) {
            //cout << "k = " << k <<"\n";
            cout << "minim maxim = " << minim << ' ' << maxim << "\n";
        }
        if (sh) {
            cout << "\n";
        }
        if (maxim == 9 && minim == 0) {
            return x;
        }
        x++;
    }
}

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int t=1;
    cin >> t;
    for (int go = 0; go < t; ++go) {
        int l, r; cin >> l >> r;
        if (sh) {
            cout << "l r = " << l << ' ' << r << "\n";
        }
        int ans = -1;
        ans = get(l);
        if (sh) {
            cout << "ans = " << ans << "\n";
        }
        if (ans > r) {
            ans = seek(l, r);
            if (sh) {
                cout << "delta ans = " << ans << "\n";
            }
        }
        cout << ans << "\n";
    }
}