import java.io.*;

public class Main {
	static int[] values = {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};


	static void readAndWrite() {
		try {
		BufferedReader br = new BufferedReader(new FileReader("cifra.in"));
		BufferedWriter bw = new BufferedWriter(new FileWriter("cifra.out"));
		int t = Integer.parseInt(br.readLine());
		// System.out.println(t);
		int u = 0;
		int p = 0;
		int c;
		for(int i = 1; i<=t; i++) {
			p = '0';
			u = '0';
			do {
			c = br.read();
			if(c == '\r') 
				br.read();
			if(c == '\n')
				break;
			else {
				p = u;
				u = c;
			} 
				//System.out.println(c-'0');

			} while(true);

			int n = (p-'0')*10+(u-'0');
			// System.out.println(n);

			// String line = br.readLine();
			// int where = (line.length()>2)? line.length()-2 : 0; 
			// int n = Integer.parseInt(line.substring(where));
			bw.write(values[n]+"\n");
		}
		br.close();
		bw.close();
	}
	catch (Exception e) {
		e.printStackTrace();
	}

	}

	static int power(int val) {
		int x = (val >= 10) ? val % 10 : val;
		int pow = x;
		int n= val;
		while(--n > 0) {
			pow = pow * x;
			pow = (pow > 10) ? pow % 10 : pow;
		}
		return pow;
	}

	static void precompute() {
		
		values[0] = 0;
		System.out.println("{");
		for(int i = 1; i < 100; i++) {
			values[i] = (power(i)+values[i-1])%10;
			System.out.print(""+values[i]+",");
		}
	}

	public static void main(String[] args) {
//		precompute();
		readAndWrite();

	}
}