#include <bits/stdc++.h>
using LL = long long;
using namespace std;
vector<LL> numbers;
int countClassy(LL limit) {
  auto position =
      std::lower_bound(std::begin(numbers), std::end(numbers), limit);
  return position - std::begin(numbers);
}
LL getPow10(int exponent) {
  LL p = 1;
  while (exponent--) {
    p *= 10;
  }
  return p;
}
void bk(int position, LL currNumber, int leftNonZeroes) {
  if (position > 18) {
    numbers.push_back(currNumber);
    return;
  }
  bk(position + 1, currNumber, leftNonZeroes);
  LL pow10 = getPow10(position);
  if (leftNonZeroes >= 1) {
    for (int digit = 1; digit <= 9; ++digit) {
      bk(position + 1, currNumber + digit * pow10, leftNonZeroes - 1);
    }
  }
}
int main() {
  bk(0, 0, 3);
  std::sort(begin(numbers), end(numbers));
  int q;
  cin >> q;
  LL l, r;
  while (q--) {
    cin >> l >> r;
    cout << countClassy(r + 1) - countClassy(l) << '\n';
  }
  return 0;
}

### Prompt

Create a solution in CPP for the following problem:

Let's call some positive integer classy if its decimal representation contains no more than 3 non-zero digits. For example, numbers 4, 200000, 10203 are classy and numbers 4231, 102306, 7277420000 are not.

You are given a segment [L; R]. Count the number of classy integers x such that L ≤ x ≤ R.

Each testcase contains several segments, for each of them you are required to solve the problem separately.

Input

The first line contains a single integer T (1 ≤ T ≤ 10^4) — the number of segments in a testcase.

Each of the next T lines contains two integers L_i and R_i (1 ≤ L_i ≤ R_i ≤ 10^{18}).

Output

Print T lines — the i-th line should contain the number of classy integers on a segment [L_i; R_i].

Example

Input

4
1 1000
1024 1024
65536 65536
999999 1000001


Output

1000
1
0
2

### Response

```cpp
#include <bits/stdc++.h>
using LL = long long;
using namespace std;
vector<LL> numbers;
int countClassy(LL limit) {
  auto position =
      std::lower_bound(std::begin(numbers), std::end(numbers), limit);
  return position - std::begin(numbers);
}
LL getPow10(int exponent) {
  LL p = 1;
  while (exponent--) {
    p *= 10;
  }
  return p;
}
void bk(int position, LL currNumber, int leftNonZeroes) {
  if (position > 18) {
    numbers.push_back(currNumber);
    return;
  }
  bk(position + 1, currNumber, leftNonZeroes);
  LL pow10 = getPow10(position);
  if (leftNonZeroes >= 1) {
    for (int digit = 1; digit <= 9; ++digit) {
      bk(position + 1, currNumber + digit * pow10, leftNonZeroes - 1);
    }
  }
}
int main() {
  bk(0, 0, 3);
  std::sort(begin(numbers), end(numbers));
  int q;
  cin >> q;
  LL l, r;
  while (q--) {
    cin >> l >> r;
    cout << countClassy(r + 1) - countClassy(l) << '\n';
  }
  return 0;
}

```