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

int main(){

	int solutie[100] = {
		0,1,5,2,8,3,9,2,8,7,7,8,4,7,3,8,4,1,5,4,4,5,9,6,2,
		7,3,6,2,1,1,2,8,1,7,2,8,5,9,8,8,9,3,0,6,1,7,0,6,5,
		5,6,2,5,1,6,2,9,3,2,2,3,7,4,0,5,1,4,0,9,9,0,6,9,5,
		0,6,3,7,6,6,7,1,8,4,9,5,8,4,3,3,4,0,3,9,4,0,7,1,0	
	};

	FILE *fin, *fout;
	fin = fopen("cifra.in","r");
	fout = fopen("cifra.out","w");
	
	int t,n;
	char n_mare[101], n_mic[2];

	

	fscanf(fin,"%d",&t);
	for (int i = 0; i < t; i++){

		fscanf(fin,"%s",&n_mare);

		n_mic[1] = n_mare[ strlen(n_mare) - 1];
		if (strlen(n_mare) > 1 )	n_mic[0] = n_mare[strlen(n_mare) - 2];
		else n_mic[0] = '0';
		
		n = atoi(n_mic);
		
		fprintf(fout,"%d\n",solutie[n]);
	}
	
	fclose(fin);
	fclose(fout);
	return 0;
}