#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
#define rep(i, n) for (int i = 0; i < n; i++)

ll f(ll x) {
  string s = to_string(x);
  vvvl dp(s.size() + 1, vvl(10, vl(2, 0)));
  dp[0][0][1] = 1;
  rep(i, s.size()) {
    rep(j, 10) {
      // k==0(好きにしていい)
      rep(k, 10) dp[i + 1][max(j, k)][0] += dp[i][j][0];
      // k==1(ギリギリ注意報)
      rep(k, s[i] - '0') dp[i + 1][max(j, k)][0] += dp[i][j][1];
      dp[i + 1][max(j, s[i] - '0')][1] += dp[i][j][1];
    }
  }
  ll sm = 0;
  rep(j, 10) {
    rep(k, 2) { sm += dp.back()[j][k] * j; }
  }
  return sm;
}

int main() {
  int t;
  cin >> t;
  rep(_, t) {
    ll l, r;
    cin >> l >> r;
    cout << f(r) - f(l - 1) << endl;
  }
}