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#include<iostream>
#include<fstream>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int v[101],x,n,a,b;
string s;
int main()
{
fin>>n;
for(int i=1;i<=100;i++)
{
x=1;
for(int k=1;k<=i;k++)
{
x*=i;
x%=10;
}
v[i]=v[i-1]+x;
v[i]%=10;
}
getline(fin,s);
for(int i=1;i<=n;i++)
{
a=0;
getline(fin,s);
x=s.size();
x--;
if(x!=0) a=s[x-1]-'0';
b=s[x]-'0';
a*=10;
a+=b;
fout<<v[a]<<'\n';
}
}