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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cifra.in");
ofstream g("cifra.out");
int t,v[13],x,r,rez;
string s;
int main()
{
f>>t; getline(f,s);
for(int i=1;i<=9;++i)
{
x=1;
for(int j=1;j<=i;++j)
{
x*=i;
x%=10;
}
v[i]=x;
v[i]+=v[i-1];
v[i]%=10;
}
for(int i=1;i<=t;++i)
{
getline(f,s);
r=s[s.size()-1]-'0';
if(s.size()==1) rez=0;
else rez=(v[9]*(s[s.size()-2]-'0'));
rez%=10;
rez+=v[r];
rez%=10;
g<<rez<<'\n';
}
return 0;
}