#include <bits/stdc++.h>
template <typename T>
void MACRO_VAR_Scan(T& t) {
  std::cin >> t;
}
template <typename First, typename... Rest>
void MACRO_VAR_Scan(First& first, Rest&... rest) {
  std::cin >> first;
  MACRO_VAR_Scan(rest...);
}
template <typename T>
void MACRO_VEC_ROW_Init(int n, T& t) {
  t.resize(n);
}
template <typename First, typename... Rest>
void MACRO_VEC_ROW_Init(int n, First& first, Rest&... rest) {
  first.resize(n);
  MACRO_VEC_ROW_Init(n, rest...);
}
template <typename T>
void MACRO_VEC_ROW_Scan(int p, T& t) {
  std::cin >> t[p];
}
template <typename First, typename... Rest>
void MACRO_VEC_ROW_Scan(int p, First& first, Rest&... rest) {
  std::cin >> first[p];
  MACRO_VEC_ROW_Scan(p, rest...);
}
template <typename T>
inline T CHMAX(T& a, const T b) {
  return a = (a < b) ? b : a;
}
template <typename T>
inline T CHMIN(T& a, const T b) {
  return a = (a > b) ? b : a;
}
void CHECKTIME(std::function<void()> f) {
  auto start = std::chrono::system_clock::now();
  f();
  auto end = std::chrono::system_clock::now();
  auto res = std::chrono::duration_cast<std::chrono::nanoseconds>((end - start))
                 .count();
  std::cerr << "[Time:" << res << "ns  (" << res / (1.0e9) << "s)]\n";
}
using ll = long long;
using ull = unsigned long long;
constexpr ll INFINT = 1 << 30;
constexpr ll INFINT_LIM = (1LL << 31) - 1;
constexpr ll INFLL = 1LL << 60;
constexpr ll INFLL_LIM = (1LL << 62) - 1 + (1LL << 62);
constexpr double EPS = 1e-7;
constexpr ll MOD = 1000000007;
constexpr double PI = 3.141592653589793238462643383279;
ll dp[16][2][16];
ll dp2[16 * 16 * 16 * 16][16];
ll decode(char c) {
  if (('0' <= c && c < '9' + 1)) {
    return c - '0';
  }
  return c - 'a' + 10;
}
std::string decl(std::string s) {
  if (s == "0") return s;
  ll p = (ll)s.size() - 1;
  while (true) {
    if (s[p] == '0') {
      s[p] = 'f';
      --p;
      continue;
    }
    if (s[p] == 'a')
      s[p] = '9';
    else
      --s[p];
    break;
  }
  return s;
}
ll calc(std::string s) {
  if (s.size() <= 4) {
    ll t = std::stoi(s, nullptr, 16);
    return dp2[t][0];
  }
  ll res = 0;
  ll t = std::stoi(s.substr(s.size() - 4), 0, 16);
  ll max = 0;
  for (ll i = 0; i < ll(s.size() - 4); ++i) {
    CHMAX(max, decode(s[i]));
  }
  res += dp2[t][max];
  for (ll i = 0; i < ll(16); ++i)
    for (ll j = 0; j < ll(2); ++j)
      for (ll k = 0; k < ll(16); ++k) dp[i][j][k] = 0;
  dp[0][0][0] = 1;
  for (ll i = 0; i < ll(s.size() - 4); ++i)
    for (ll j = 0; j < ll(2); ++j)
      for (ll k = 0; k < ll(16); ++k) {
        ll sdigit = decode(s[i]);
        ll lim = j ? 16 : sdigit + 1;
        for (ll d = 0; d < ll(lim); ++d) {
          dp[i + 1][j || d < sdigit][std::max(k, d)] += dp[i][j][k];
        }
      }
  for (ll i = 0; i < ll(16); ++i) {
    res += dp[s.size() - 4][1][i] * dp2[16 * 16 * 16 * 16 - 1][i];
  }
  return res;
}
signed main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  ;
  ll Q;
  MACRO_VAR_Scan(Q);
  ;
  for (ll i1 = 0; i1 < ll(16); ++i1)
    for (ll i2 = 0; i2 < ll(16); ++i2)
      for (ll i3 = 0; i3 < ll(16); ++i3)
        for (ll i4 = 0; i4 < ll(16); ++i4)
          for (ll j = 0; j < ll(16); ++j) {
            ll i = i1;
            i *= 16;
            i += i2;
            i *= 16;
            i += i3;
            i *= 16;
            i += i4;
            if (i == 0) continue;
            ll max = std::max({i1, i2, i3, i4, j});
            dp2[i][j] = dp2[i - 1][j];
            dp2[i][j] += (i >> max) & 1;
          }
  for (ll q = 0; q < ll(Q); ++q) {
    std::string sl, sr;
    MACRO_VAR_Scan(sl, sr);
    ;
    ll l = calc(decl(sl));
    ll r = calc(sr);
    std::cout << r - l;
    std::cout << "\n";
    ;
  }
  return 0;
}
