#include <iostream>
#include <fstream>
#include <string.h>
#include <stdlib.h>

using namespace std;

int main(int argc, char** argv) {
	ifstream f("cifra.in");
    ofstream g("cifra.out");
    string n;
    int cate;
    int lung,numar,i,unit,cifra;
    int cifre[21] = {1 , 1 , 5, 2, 8, 3, 9, 2, 8, 7, 7, 8, 4, 7, 3, 8, 4, 1, 5, 4, 4}; 
    f>>cate;
	for(i =0;i<cate;i++){
		f>>n;
    	lung = n.length();
    	if(lung>=2){
    		numar = n[lung-2] - '0';
    		numar = 10 * numar;
    		unit = n[lung -1] -'0';
    		numar = numar + unit;
    		unit = numar / 20;
    		numar = numar%20;
    		cifra = cifre[20] * unit + cifre[numar];
    		cifra = cifra % 10;
		}
		else{
			numar = n[lung -1] - '0';
			cifra = cifre[numar];
		}
		g<<cifra<<endl;	
	}
	return 0;
}