#include "stdio.h"

int t;
char letter[100002];
int num[100000];
int ans[100000];
int dis;

int main() {
	scanf("%d", &t); 
	for (int i = 0; i < t; i++) {
		scanf("%s", letter);
		for (int i = 0;i<100002; i++) {
			if (letter[i] == NULL) {
				dis = i;
				break;
			}
			num[i] = letter[i] - '0';
		}
		while (dis > 1) {
			for (int j = 0; j < dis-1; j++) {
				num[j] = num[j] + num[j + 1];
				if (num[j] > 9)num[j] -= 9;
			}
			dis--;
		}
		ans[i] = num[0];
	}
	for (int i = 0; i < t; i++) {
		printf("%d\n", ans[i]);
	}
}