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#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;
int i,x,p,d,s,j2,j,t,i2,n1,uc,uc2,nou=1;
string n;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int main()
{
fin>>t;
for(i=1;i<=t;i++)
{
uc=0;
s=0;
fin>>n;
if(n.size()!=1)
{
x=n[n.size()-2]-'0';
uc=x*7%10;
}
j=n[n.size()-1]-'0';
x=j;
for(j2=1;j2<=j;j2++)
s=s+pow(j2,j2);
uc=uc+s;
fout<<uc%10<<endl;
}
return 0;
}