#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>

int main(){
	char c;
	int t;
	freopen("cifra.in","r", stdin);
	freopen("cifra.out","w", stdout);
	scanf("%d", &t);
	int i;
	int n = 0;
	int x, w, p;
	for(i = 1; i <= t; i++){
		scanf(" %s", &c);
		x = c - '0';
		p = x;
		w = 1;
		while(x > 0){
			w = w * p;
			x--;
		}
		n = n + w;
		printf("%d\n", n % 10);
	}
	return 0;
}