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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin("cifra.in");
ofstream fout("cifra.out");
int pow(int a, int p)
{
int rez=1;
while(p)
{
if(p&1)
{
rez*=a;
rez%=10;
}
a*=a;
a%=10;
p>>=1;
}
return rez;
}
int main()
{
int t,i,rez[102],nr,g;
fin >> t;
rez[0]=0;
for(i=1;i<=100;i++)
{
rez[i]=rez[i-1]+pow(i%10,i);
rez[i]%=10;
}
char a[103];
fin.get(a[0]);
for(i=1;i<=t;i++)
{
nr=0;
fin.getline(a,102);
g=strlen(a);
if(g==1)
nr=a[0]-'0';
else
nr=(a[g-2]-'0')*10+a[g-1]-'0';
fout << rez[nr] << "\n";
}
return 0;
}