#include<iostream>
#include<iomanip>
#include<vector>
#include<queue>
#include<math.h>
using namespace std;

#define OVERLOAD_REP(_1, _2, _3, name, ...) name
#define REP1(i, n) for (auto i = std::decay_t<decltype(n)>{}; (i) != (n); ++(i))
#define REP2(i, l, r) for (auto i = (l); (i) != (r); ++(i))
#define rep(...) OVERLOAD_REP(__VA_ARGS__, REP2, REP1)(__VA_ARGS__)
#define REP(i, l, r) rep(i, l, r + 1)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

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

struct Edge {
    int to;
    ll w;
};

using Graph = vector<vector<int>>;
// using Graph = vector<vector<Edge> >;
const ll INF = 2e18;
// const int INF = 2e9;

template <class T> using vc = vector<T>;
template <class T> using vv = vector<vector<T>>;
template <class T> using vvv = vector<vector<vector<T>>>;
template <class T> using pq = priority_queue<T>;
template <class T> using pq_g = priority_queue<T, vc<T>, greater<T>>;

template <class T> istream &operator>>(istream &i, vc<T> &v) {
    rep(j, 0, v.size()) i >> v[j];
    return i;
}
template <class T> ostream &operator<<(ostream &o, vc<T> &v) {
    rep(j, 0, v.size()) o << v[j] << " ";
    return o;
}

template <class T> bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T> bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

constexpr double EPS = 1e-9;
inline bool eq(double a, double b) { return fabs(a - b) < EPS; }
inline bool lt(double a, double b) { return a < b - EPS; }
inline bool gt(double a, double b) { return a > b + EPS; }
inline int sgn(double x) {
    if (x > EPS) return 1;
    if (x < -EPS) return -1;
    return 0;
}
#define int ll
signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(10);

    int T;cin>>T;
    while(T--){
        ll L,R;cin>>L>>R;
        auto f=[](ll n)->vc<ll>{
            string N=to_string(n);
            int l=N.size();
            vvv<ll>dp(l+1,vv<ll>(2,vc<ll>(10)));
            dp[0][0][0]=1;
            rep(i,0,l){
                rep(s,0,2){
                    rep(j,0,10){
                        for(int x=0;x<=(s?9:N[i]-'0');x++){
                            dp[i+1][s||x<N[i]-'0'][max((ll)j,x)]+=dp[i][s][j];
                        }
                    }
                }
            }
            vc<ll>res(10);
            rep(i,0,10)res[i]=dp[l][0][i]+dp[l][1][i];
            return res;
        };
        auto x=f(R),y=f(L-1);
        ll ans=0;
        rep(i,0,10)ans+=(ll)i*(x[i]-y[i]);
        cout<<ans<<endl;
    }

    return 0;
}