CF1288B

#include <bits/stdc++.h>
using namespace std;
#define test int t; cin>>t; while (t--)
#define ll long long int
#define fellow_junior  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int main()
{
    fellow_junior
    test
    {
        ll a,c,d,e,f,i,j,k,l;
        cin>>a>>c;
        d=0;
        e=9;
        while(c>=e)
        {
            d+=a;
            e=9+e*10;
        }
        cout<<d<<endl;
    }

    return 0;
}