#include<bits/stdc++.h>
using namespace std;


int main()
{
    long long int t,i,sqt,j,k,n,mx,ans,con1;
    string a,con;
    cin>>t;
    while(t--)
    {
        mx=0,ans=0;
        cin>>n>>k;
        set<long long int>s;
        s.clear();
        mx=k;
        while(s.find(k)==s.end())
        {
            s.insert(k);
            sqt=k*k;
            con=to_string(sqt);
            a="";
            for(i=0;i<n;i++)
                a+=con[i];
            con1=stoi(a);
            if(con1>mx)
                mx=con1;
            k=con1;
        }
        cout<<mx<<endl;
    }
    return 0;
}