#include<bits/stdc++.h>
using namespace std;
int main()
{
    //freopen("text","r",stdin);
    int T;
    scanf("%d",&T);
    while(T--)
    {
        long long a,b;
        cin>>a>>b;
        if(b<9)
            printf("0\n");
        else{
            if(b<99)
                cout<<a<<endl;
            else if(b<999)
                cout<<a*2<<endl;
            else if(b<9999)
                cout<<a*3<<endl;
            else if(b<99999)
                cout<<a*4<<endl;
            else if(b<999999)
                cout<<a*5<<endl;
            else if(b<9999999)
                cout<<a*6<<endl;
            else if(b<99999999)
                cout<<a*7<<endl;
            else if(b<999999999)
                cout<<a*8<<endl;
            else
                cout<<a*9<<endl;
        }
 
    }
    return 0;
}