#include<fstream>   
#include<math.h>   
  
using namespace std;   
  
#define input "cifra.in"   
#define output "cifra.out"   
  
  
ifstream fin (input);   
ofstream fout (output);   
int main ()   
{   
    int n,S=0,i,nr,p;   
    fin>>n;   
    for(i=1;i<=n;i++)   
    {fin>>nr;   
              p=pow(nr,nr);   
                     S+=(p%10);   
                     fout<<S%10;   
                      if(i<=n-1)   
                     fout<<endl;   
                     if(i<=n-1)   
                     {    
                               fin>>nr;   
                               i++;   
                    p=pow(nr,nr);   
                     S+=p;   
                     fout<<S%10;   
                     if(i<=n-1)   
                     fout<<endl;   
                     }   
                     }   
                     return 0;   
                     }