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#include <fstream>
using namespace std;
int v[102];
ifstream cin("cifra.in");
ofstream cout("cifra.out");
int main()
{
int s=0,p=0,u;
string st;
for(int i=1;i<=99;i++)
{
p=1;
int h=i%4;
if(h==0)
h=4;
for(int j=1;j<=h;j++)
{
p*=i;
p%=10;
}
s+=p;
s%=10;
v[i]=s;
}
cin>>s;
for(int i=1;i<=s;i++)
{
cin>>st;
if(st.size()>1)
u=(st[st.size()-2]-'0')*10+st[st.size()-1]-'0';
else
u=st[st.size()-1]-'0';
cout<<v[u]<<"\n";
}
return 0;
}