#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
void balik(ll K, ll &result) {
ll F = 0;
while (K > 0) {
F += K % 10;
K /= 10;
}
if (F > 9) balik(F, result);
else result = F;
}
int main() {
ll N;
cin >> N;
ll A, B;
for (ll i = 1; i <= N; i++) {
ll ans = 0;
cin >> A >> B;
ll hasilA, hasilB;
balik(A, hasilA);
balik(B, hasilB);
ll H = max(hasilA, hasilB);
ll D = min(hasilA, hasilB);
for (ll j = D; j <= H; j++) {
ans += j;
}
cout << ans << endl;
}
}
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