#include <bits/stdc++.h> using namespace std; int main(){ int t; cin>>t; while(t--){ unsigned long long a,b; cin>>a>>b; unsigned long long hasil=0; unsigned long long has=0; if(b-a>0){ cout<<(b*(b+1))/2<<endl; } else { while(a>0){ hasil+=a%10; a/=10; } while(hasil>0){ has+=hasil%10; hasil/=10; } cout<<has<<endl; } } }