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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t,x,pre[105];
string s;
int main()
{
f>>t;
for(int i=1;i<=100;++i)
{
x=1;
for(int j=1;j<=i;++j)
{
x*=i;
x%=10;
}
pre[i]=x;
pre[i]+=pre[i-1];
pre[i]%=10;
}
getline(f,s);
for(int i=1;i<=t;++i)
{
getline(f,s);
if(s.size()>1)
{
x=((s[s.size()-2]-'0')*10+s[s.size()-1]-'0');
}
else
{
x=s[s.size()-1]-'0';
}
g<<pre[x]<<'\n';
}
return 0;
}