#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
int balik(int K, int F = 0) {
while (K > 0) {
F += K % 10;
K /= 10;
}
if (F > 9) return balik(F);
else return F;
}
int main() {
// int Hai;
// int Dar;
int N;
cin >> N;
vector<int> A(N);
vector<int> B(N);
for (int i = 1; i <= N; i++) {
cin >> A[i] >> B[i];
int maxim = max(balik(A[i]), balik(B[i]));
int minim = min(balik(A[i]), balik(B[i])) - 1;
// Hai = minim - 1;
// Dar = maxim;
int H = minim*(minim + 1)/2;
int D = maxim*(maxim + 1)/2;
cout << D - H << endl;
}
}
// output
// 15
// 3
