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#include <fstream>
using namespace std;
int main () {
ifstream f("cifra.in");
ofstream g("cifra.out");
int t;
f>>t;
for(int i=1; i<=t; i++){
long long n, s=0, c=1, x, q=0;
f>>n;
s=(n/10)*7;
for(int i=(n/10)*10; i<=n; i++)
{ x=i%10;
c=1;
for(int k=1; k<=i%4; k++)
{
c=c*x;
}
q=q+c;
}
if(n/10%2==1)g<<(q+s)%10<<endl;
if(n/10%2==0 && (q+s)%10==0) g<<9<<endl;
if(n/10%2==0 && (q+s)%10!=0) g<<(q+s)%10<<endl;
}}