t = int(input())
for _ in range(t):
l, r = list(map(int, input().split()))
ans = 0
while l != 0 or r != 0:
ans += r-l
l = l//10
r = r//10
print(ans)#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
void pre() {
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
int cnt(int x) {
int ans = 0;
while (x) {
ans += x;
x /= 10;
}
return ans;
}
void solve() {
int l, r;
cin >> l >> r;
int ans = cnt(r) - cnt(l);
cout << ans << endl;
}
int main() {
pre();
int t;
cin >> t;
while (t--) {
solve();
}
}
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