#include "stdio.h"
#include "math.h"
using namespace std;
	int main()
		{
			FILE * a;FILE * b;
			a = fopen("cifra.in","r");
			b = fopen("cifra.out","w");
			int t;
			int aux;
			fscanf(a,"%d",&t);
			int s=0;
			for(int i=0;i<t;i++)
				{
					fscanf(a,"%d",&aux);
					s+=pow(aux,aux);
					s%=10;
					fprintf(b,"%d\n",s);
				}
			fclose(a);
			fclose(b);
			return 0;
		}