import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }




void main() {
  try {
    for (; ; ) {
      const numCases = readInt;
      foreach (caseId; 0 .. numCases) {
        const N = readToken;
        const K = readToken;
        const NLen = cast(int)(N.length);
        const KLen = cast(int)(K.length);
        
        auto dp = new long[][][](NLen + 1, 3, 2);
        dp[0][1][0] = 1;
        foreach (i; 0 .. NLen) {
          const n = N[i] - '0';
          const k = (i < KLen) ? (K[i] - '0') : -1;
          foreach (s; 0 .. 3) foreach (t; 0 .. 2) {
            foreach (x; 0 .. 10) if (t || x <= k) {
              if (i == 0 && x == 0) continue;
              dp[i + 1][(s != 1) ? s : (x < n) ? 0 : (x == n) ? 1 : 2][(t || x < k) ? 1 : 0] += dp[i][s][t];
            }
          }
        }
        long ans;
        foreach (i; 1 .. NLen + 1) {
          foreach (s; 0 .. 3) foreach (t; 0 .. 2) {
            if (i < NLen || s <= 1) {
              debug {
                if (NLen <= 10) {
                  writeln([i, s, t], ": ", dp[i][s][t]);
                }
              }
              ans += dp[i][s][t];
            }
          }
        }
        writeln(ans);
      }
    }
  } catch (EOFException e) {
  }
}